Help with 340 compression + cam change

Good complete info! But something is not hanging together......

With those pistons with their loooow CH of 1.740", I come up with 8.2 static CR. No way with that cam that you would come up with 160 psi cranking compression, unless perhaps the lifters were all drained of oil and the intake closing was reeeeally early... (Or there is a turbo running on it sitting still LOL)