Help! Swapped 302 heads on my 318.

So i dont know the cam specs. It was in the motor when i got it years ago. I know its a mild cane cam. When i put the pushrods in i had the intake off and made sure they were seated in the lifters. They were the same ones that were already in it. The cam looked really good still. When i hand turned the motor with the valve covers off i didnt notice anything out of the ordinary. There isnt any adjustment on the rockers. They are just the stamped steel ones. I didnt see anything popping. When you try to crank it you dont hear anything radling around only when i fires up