I bought a 351 with x heads worked pretty well. It has around 10-1 compression. The problem I have noticed is maybe my cam is just totaly wrong. The motor came with a intake that didn't fit the heads and a 750 B/G speed demon. I have decided against the carb. I bought a Trick Flow EFI intake,30lb inj,pro-m mass,75mm t/b. The intake is good to 6500 at least they say it is. The one thing I didnt know was the cam.Later I found that it was a Isky 292 Mega cam. I think the cam has 538 lift and 244@.050. What should I exspect. I the intake and front cover were just put on but the motor is still on the stand. So if I NEED to change it let me and with what? Please remember this is a 351 non roller not a 302.