thanks for the reply guys.

yup power is what i was chasing, suspension is all sorted out already.

i was thinking bout the A14 or 15 but i have got a Solid Low Kay A12 in the Car to start with, you know lil old lady only drove it on Sundays Deal, 40,000 KMS

generally the old school rules of engine work apply awesomely to the A series and new school modifications work a treat too!
old school way: Theres no replacement for displacement so try to start with an A15 or A14 for the extra torque advantage. The three big gains are had in compresion, carburettors and camshaft so shaving the head and fitting flat tops will up the compression, fitting twin sidedraughts will let it breathe up high in the revrange and the right cam for your power range will tie it all together as long as you have some good competition valve springs and big end studs fitted.
Electronic ignition, thermo fans, oil cooling and a good free flowing exhaust will make her run even better.
New school way: You can also turbo the A series with great results so check out the tech section for ideas on how people go about this, be it a draw through set up or blow through or even a wild twin turbo set up like 1200rallycar has done, there is some amazing examples here that will make chossing between a tough N/A build or a off-it's-head shrieking, whooshing and whistling turbo screamer harder than you think
Welcome to the site your gonna love it here!

go some twin carbs...

dont make it complicated longbrow . sounds like he just wants to know what engine mods give the best "bang for buck". id sugest a cam. but use the search tab. very helpful.

Greetings denman-
1. I assume you have found the Tech Section on this website-if not ck it out.
2. Can you be more specific or narrow down your question to a catagory,i.e,suspension,airflow,cooling,head etc.?
I am afraid your question is so general, that most people either would'nt know where to start or would provide you with a thousand documents on Mods.
You will likely garner more responses by providing a specific topic.
Welcome aboard The collective knowledge on this site is incredible-use it!

Well i am new to the site and i don't really like asking for info on a 3rd post but you guys are the experts.

my question is about modifying the A12 for a bit more response.

I race my 120Y in a local rally club and have only done the usual extractors and exhaust for power and put a stanza front end in for bigger brakes and a bit of negative camber.

just want peeps experiences on what they have done and if they feel it is worth while doing.

thanks in advance