What they said, I would not cut/mill anything instead I'd either bolt it together w an .020" or thicker if need be gasket or I'm wondering if it would it be possible/practical to pull the pan/rods/pistons & R&R the pistons with some higher CR ones and balance them to the orig piston/pin/rings weight and ball hone the block plus that'd give you fresh rings but as I am typing I realized that the KB's MIGHT be much different in weight than the oe's but not sure if the diff would be enough to badly screw up your bobweight. I'm a firm believer in running what you have in the car now & maximizing it as opposed to what might come about in the future but the CR in the low 8's or even likely in the low 7's is really going to be a problem (change the cam to build some psi).