Been considering swapping my ej255 engine in my wrx to either a ej257 or ej207. But i have been having troubles locating a ej257 without a ridiculous price tag associated with it, iv seen alot of people swaping just a ej257 shortblock and keeping the wrx heads and using a thicker headgasket with arp headstuds, with different degrees of success. I was wondering if i got my hands on a ecu and engine loom from a ej20 model (wrx or sti) and swapped in a v7/v8 207 which cost alot less, would it be that much of a pain to swap in over the current ej255?

I have a friend who is mid way through putting a v7 sti moter into his 02 wrx so i would be looking todo this myself with his help.