If you have 12g then just do a 4agte or an SR20det, the let down with most 7age's is that people use small port heads, I have seen 7age's make from 90hp up to 180hp, to build one quickly you just stick 4age pistons in the 7a block (valve cuts), bolt the 4age head on and use a porsche 994 (I think) timing belt.