Machine shop said the current 4.070 bore is too sloppy and it needs to go to 4.080 for a cleanup. They said if I ran it, with the current bore and 4.070 pistons there would be piston slap. I believe them.
That makes more sense. I'd still get some NUMBERS for wear. A good, fresh, straight, clean bore is essential for any build, but they shouldn't be afraid to give you actual numbers. It's your money after all.