The SR20 swap has been done plenty of times - but why use one of those awful tractor engines when a G63B twin cam is a far better engine? It will also skip the headache of bolting it to a transmission and then playing with a custom tailshaft and engine/gearbox mounts. Mitsubishi's are awesome when it comes to parts adaptability. Plus this forum will be more than helpful if you're after info on how to do it right