probably what you have is a Z24I, that was a Z24 with throttle body injection, they look a lot like a carb.

Jamie,
I second that statement, I teach this stuff every day. More to the point, I have delt with emission controlls for over 30 years.
honestly, it sounds to me as though somewhere you have gotten some information that is incorrect.
as an aside, before there was a pcv system, engines had what was called a road draft tube. basicly this was a tube about an inch in diameter that hung off the side of the engine, ending at about the bottom of the oil pan. oil caps were vented to allow fresh air in and the crankcase gasses vented out the end ot the tube, it took them a while to figure out that all that oil all over the bottom of one's car came from that road draft tube.

PCV=Positive Crancase Ventalation, the reason it's there is to allow the crankcase to breathe.
think of it this way: for every bit of air that moves through the intake and exhaust manifolds, an EQUEAL amount moves through the crankcase. some of this being blow by past the piston rings.
the pcv system is there to allow fresh air to vent those gasses out of the crankcase, and the pcv valve is there to ensure that the air for venting moves in 1 direction only. the pcv valve is also designed so that if there is a backfire, that the flame will not burn back into the crankcase and cause it to blow up(yes it has happened) there is no bennifit or performance gain from disconecting or modifying the pcv system. there is a slight fuel milage advantage to having one that works because it will take unburned gas and feed it back through the engine. as far as getting oil through the hose into the intake, there is a screen baffle inside the engine crankcase to help prevent this, if one has an excessive amount of oil passing through, then the rings are worn and should be replaced.

the A12 has a 73 mm. bore, the A12A has a 76mm. bore.
they use the same crankshaft which has a 70 mm. stroke.
the A12A has a block that is similar to the A13, A14, and A15 with the distributor between cylinders 3 and 4. the A12 has the distributor by cylinder 1. the A12A also has the revised oiling system like the larger A series.

if it's a coupe, the number is
26521-H1800
I don't know what it is for a sedan however

I am in no way trying to rag on anyone.
we have all strayed off topic now and then, and I don't expect that it will stop in the future. all I was trying to say is that comming across with attitude just creates problems in the long run.
personally, I like to see the discussion and inclusion of all the models that shared the A series engine, the interchangability between them is great. more to the point, as one of those who was fortunite to be able to own a 1200 when they were new, it's nice to see the following that they have.
the B210/120Y was kind of the ugly stepchild of the bunch (at least the USA version was) and it didn't gain the popularity in later life that the other "Sunny" based models have, but it is still one of the family.
the one thing that they all have in common is that they are tough durable cars that never have been given the respect that they deserve.
we all share a common interest here, we shouldn't let stupid stuff get in the way and ruin a good thing.

hey team dat,
lighten up a little bit. we all need to remember that we are all here as guests of the Branco brothers.
without them and thier hard work, this wouldn't be the site that it is.
yes the B210/120Y share a lot of things with the 1200, but there are other things that they do not share as well.
true, we can all learn from each other, but it won't happen when someone flames another for expressing an opinion.

the best way to do it is to put a breather filter on the pipe on the rocker cover, that is the inlet for the engine breather system, a filter will allow fresh air in and keep the dirt out.
then to the pipe in question, you want a hose to a catch can, or if you want to a PCV valve in the intake manifold, either way will work well.
the one thing that you don't want to do is connect the 2 together, if you do, you will get excessive pressure in the crank case and cause it to blow oil out.

while your at it, along with the pivot bushings (#32), replace tha lower bushing(#33), and the boot (#36) that covers it all up.
the lower bushing will take the slop out of the shifter, and the boot will prevent any dirt from getting into things and causing premature wear.

try adjusting the valves, they should be set at 0.014" hot.
if the intake valves are tight (which usually happens with normal wear), they will stay slightly open and will cause a backfire, rough idle, running rich, and over all poor performance.
if they valves are adjusted correctly, then check for a plug wire that gets cross fire, or is in the incorrect position in the firing order.
if that still doesn't do it, check the inside of the distributor cap for carbon arcing, this is a trail of carbon deposits that gets left with normal use.
remember when in doubt, go back to the basics and check everything, twice if you have to, that way your sure that you covered it.