Help! Swapped 302 heads on my 318.

victa15 said
Heads have been sitting for a few years in my shed. The machine shop cleaned them and did a valve job with new stem seals

Try loosening the rocker arms not completely loose but a tad bit un plug the coil crank the motor and see if you get any cylinder PSI with your comp tester that would let you know if your push rods are too long