What heads are you running ?

Have you MACHINED the open parts of the chambers to EQUALIZE THE DEPTHS from one end of the head to the other ? Measure the depths of the open part of the chambers , but you need to do it with the PROPER TOOLS , NOT a ruler and feeler blades .

Has the block been DECKED to SQUARE IT ?

.020 is A LOT , the block isn't that far out , the pistons aren't rocking that much , if they are you have too much piston to wall clearance .

What rods are you using ?

Has the crank been cut ?

Isn't setting the quench distance FUN ?