my 302 is running just fine, although i had to add an aftermarket electric booster in order to maintain 22psi constant on the brakes, brakes fine now, i found that my manifold vacuum was not enough to provide the booster, this is all based on what cam is in the motor?????choppy cam equals low vacuum to the booster...........also had the same problem with my intake mani,,seating to the heads good and tight b-cause the heads had been shaved just a bit.....
lots of goop and shes good and tight runs like a charm, hauls azzzzzzz!