I just got the intake and now found a set of GT 40 (not GT40P) heads on a friends 96 explorer motor. I think I can have the heads for maby $200. I thought in the spring when I do the intake that would be a good tome to swap heads. My question is will that all make a nice power gain. I will take the heads to a local guy that it pretty good at working the heads over. I will likely have a valve job done along with some porting work and have him install some new 1.7 RR's probly. will all this with my stock cam be a nice upgrade. and any guesses on how much power I should lay down.