Yeah, I have a 94 mustang that was a 3.8 and just done a 5.0 swap, it has gt40p heads, e303 cam, edelbrock upper and lower intake. I bought a 95 GT that had been hit inthe side to do the swap, problem was the motor already had a blown head gasket so I had them shaved, now that motor is in the v6 car I seem to have a some what bad vaccum leak (i think) at the back of the lower intake, I can spray brake cleaner (prolly not the best idea) where the lower intake meets the heads and the idle picks up. What I am wondering is if you get your heads shaved is it going to affect the way your lower sits on the heads? May be a stupid question but I dont know, was also wondering if I could double up the gasket due to not wanting to shave the intake cause I do plan on updating the heads just not as soon as I would like. Sorry for the long post but really need help, car also bogs out sometimes and just doesnt seem to have the power. Thank you and any help would be greatly appreciated.