LA 318 advice

Thanks for that.

FWIW, my sealed power catalog shows the 526AP piston to have a 1.745 ch.

Obviously, for the OP’s original build to end up with pistons down the hole .100……..that’s what happens when the person ordering the parts isn’t paying attention to the details.

Out of curiosity I looked up the NHRA blueprint spec for deck clearance on a 69 318.
It’s .029” down.