318 combo

Chillipepper - I have thought about turbo, but it will totally blow my budget. No pun intended. The quality of propane in Oz is a bit hit and miss. The butane content varies which affects the octane (it's rarely pure propane). With iron heads I think 10:1 is about the highest safe static compression without running a massive cam.

Poison - it's pretty much impossible to find closed chambered heads here, and the price of head work here is very expensive. To just buy a set of heads and have some basic work done on them I think I'd be spending just as much. I'd rather spend the money on the EQs. I'm running a stock bottom end so the smaller combustion chambers should help a bit with compression as well.