I have a 312 block that I plan to use in my 55 Victoria. In sonic testing the bores I am anywhere from .238 on thick side to .195 on thin side. The engine has already been bored to .040 over to 3.840.
The engine was a re-manufactured out of a T bird at some point. During tear down bearings looked perfect and cylinders had been greased to prevent rust. Heads were not on it when I got it. After having it vatted I used a honing brush and cylinders cleaned up nice but show some rust stains NOT pitted.
I'm seriously considering just getting new pistons and doing a rebuild.
Anyone have any negatives about just a refresh or will I be pushing the limits on cylinder walls if I go out to .060 over? Sonic test was on 3 cylinders, but I will do them all to be safe.

No the main bolt holes are not cracked, block actually looks really nice.