I grenaded my slant 6

Forged or cast crank? I know forged crank bearing tabs are different, but never looked at cast crank bearings
As usual, you're absolutely right. They are different. The upper bearing in the cap places the bearing shell too far forward in the cap. Thanks Charlie. You probably saved my engine. I was told by a member here that the top bearing shells would fit and work. They were wrong. I am in your debt.