I'm thinking that the builder's had a three martini lunch before engine assembly.
A 62 413 Max block casting number with a 7/25/63 casting date that has a 426 bore !! WTF
A Sonic check will tell if it's a 413 bore 60 over, the the remaining cylinder walls will be thin
It is NOT a 413 Max Wedge Block. It is NOT A 426 Max Wedge block. Your casting number doesn’t match. You also do not have the AAQA, nor the notching. In other words, you have NONE of the 3 major Max Wedge IDs.