I would fix it by welding it. And pressure test it before filling. Thing could be cracked other places. Get someone who knows what they are doing. S/SS engine guys know people to weld iron parts.

You have to fix it. Unless something has changed, the only legal aftermarket alternative for that application is a Bulldog. They are heavy and I don't know if they are obtainable. Is the main webbing/bottom of the block any heavier on that truck block?

Call RAM in Virginia. He fixed up a stock block 383 Stocker engine for a friend which seems to be doing fine. Bub Whitaker at Burtonsville Machine is another guy who has some Mopar class cars out there.