Guessing this topic is on hold till more research is completed. Thank you very much D an dd, you guys probably just saved me quite a bit of disappointment.

You could make your own simple manifold and run r1 carbs, cheap, sound awesome and lighter than webers. Look at some youtube vids on ka24de with quad bike carbs for an example that they do flow very good for all size motors when tuned well.
I used to run quad bike carbs some 15 years ago with success, went to a bike tuner do the adjustments, jet sizing and was a blast in my A16.

Ditch the booster and fit a slightly smaller master.

I thought dual DCOEs had severe fitment issues with the B210 brake master cyl? I don't mind getting rid of the booster, but doesn't the dual setup still hit the master without the booster?

I'm not trying to be spoon fed here, but I really don't know what brake modifications in the tech wiki will work on the B210 when it comes to master cyl relocation or reverse mounting. If you wouldn't mind pointing me in the right direction or clarifying which mods will allow the dual setup to fit so I can have a better understanding, that would be great.

Single DCOE will not make more power than a single down draft 32/36 on the stock manifold. Save your money for dual DCOEs which have ITB manifolds. A new pedal box is not required.

So big question here. How much porting would be involved going from round to oval and would I be able to get similar to the same flow rates from doing this as I would get from an oval manifold?

I ask because I found a round port manifold and there is enough material to port it to oval, but what would be the point if the manifold still restricts the flow somewhere between the head and carb in the runners? Sadly I can't see this part in person so without having it in my hand I don't know how open the runners are.

I'm very tempted to throw this carb money into getting a wilwood pedal box and master cylinders and just going for dual DCOEs next summer. Those manifolds are much easier to find, but then I lose the brake booster and have the job or routing new brake lines.

Would that have been Rowland? They do carry some manifolds for Datsuns, but I don't see anything for the A-series. I may be reading it incorrectly though.

He gets a lot of stuff and has little time to advertise usually
Redline here in Oz are too exxy but theres also south africa
has some awesome manifolds for cheaper than the rest of the world
for new ones, cant find the site atm.

Thanks D, I sent him an email. His site doesn't have any listed, but I'm hoping for the best.

try peter zekert in the usa he has plenty usually second hand