The blocks were designed back in the late 50's. No computers, no finite elemant analysis, no expectation of making 800+ hp. It is a surprise that they work as well as they do. If the block design was imported into a modern analysis program then it would quickly become clear where material needed to be added to solve the cap walk issue. As far as I know, nobody has done that.

I assume the Pro Stock block benefitted from FEA work but I've never seen what those blocks look like on the bottom end. If someone was going to cast a new block they could probably cheat a bit and just copy the Pro Stock block on the assumption that it was done correctly.