V2 sti and wrx cams are the same. Sti Ra cams are better.
So best choice would be to fit a v3/4 sti engine and modify the inlet manifold to fit= headache or use your V2 intake manifold which restricts you using a front entry turbo without modding again and also the slanty intercooler ain't too good. Or find a genuine sti V2 ra engine whIch is closed deck block and better heads. Remembering also that changing things can lead to a remapped ecu = more money.