is it going to be a track car or a DD? figure out your goals first, not put in a motor, build one, swap it, and if it ends of failing you put the old one back in, then you end up with parts left over that you dont need/want. build the car ONCE. and do it right the first time.
p.s. boosting a 1.8 8v is not worth the amount of money you will spend.