I'd use the Weber 32/36 and a moderate cam with dual valve springs. If your current bores are terrible worn then go with what ever size flat tops you can find cheaply, if the bore are fine then just re-ring it. As far as the cylinder head goes you can clean up the ports, on a stock head the valve seat actually protrudes into the port about 1mm, just getting the seat flush with the port wall will increase flow a lot.

So basically if you don't need to bore the block don't, regrind the cam to a moderate spec (260 duration .375 lift), 32/36 weber, Header/extractors and larger diameter exhaust. Now as has been mentioned this will get you about 80-85HP range which is what an A14 puts out. If you can build the engine yourself than that's a plus. Also if you can find the bits used off this site or Ebay etc. then that will help as well. Even as cheap as I find stuff on the used parts market I would expect to be into the motor for $400-500.


Tom