340 with edelbrock heads overheating

i measured the push rod length and its 7.5. so i am good there. my thinking now is its cam timing and may have been like this prior and the edelrock valves hit again bending valves. not sure how i did not have the over heating problem before. i am going to be incredibly pissed if both heads have bent valves.

I am going to take both heads down to the engine builder and have him check both out and take him the motor and tell him to figure it out since he built the dam thing. He better pay for the repair too.
When I put 273 rockers on my 340 with hydraulic lifters, the 7.5 pushrods were too long. Are your shafts shimmed?