Hello, I have a 1967 CMU building and found the exterior wall block dimensions are actually 8"D x 7 5/8"H x 15 5/8"L as opposed to the standard 7 5/8"D x 7 5/8"H x 15 5/8"L. If a modern standard block is used to fill in some of the window openings there would be a 3/8" lip if the blocks are...