Fast a12 engines are pretty unique in their own rights as most upgrade to a14s/a15s as its the most simple way to up the a-series power.A worked a12 sounds great and revs hard.

Depending on what your after,if not fussy,try and minimize any weight possible while running the a12.smaller,lighter battery,fibreglass or carbon bonnet and guards ,no carpet and sound deadener, etc will not be comfy but should be fun.also a good clutch and a lighter flywheel.

Some forum members have modified a series engines and would offer better advice in relation to running methanol i.e Compression,metal head gaskets and the sort.Personally, i wouldn't run methanol on street and would first find out if its legal to use it in your state.
From what ive read on this site,very modified a series are not too street friendly.

if your after bang for buck, your better off with a good affordable turbo engine.Modified a-series gear can easily top up the costs for a turbo engine conversion with slight power increases for a lot of money spent.

and if you don't mind me asking, what bits do u have for your a-series.im very interested with a series go fast bits.pm me if you want.

cheers