what should i look for? are any of the other b20 engines worth it? if i do find one tho, what should be the first i should do as far as moding it out....i know intake header and exhaust. but im goin to want to keep my exhaust from my ls, im pretty sure i can do that. so if i do that, what should i start with. im sure you all will say internals. but what? like pistons, crank, rods, etc. im curious to what yall think.