Agreed. Theres always the sleeve fix, which I'll be figuring out soon, to start out close to 4.40 in a 400 block, if I have a junk 383 I'd see how far the bore will go before it breaks into water.
Have your boss buy you a sonic tester. I really, REALLY need one myself but it’s a great tool for a nondestructive way of finding thicknesses of matériels.
