Maybe I should make a list before posting!! I've saw several times that the Indy engine had an ALUMINUM block. That's possible, but doubtful. If you get the chance, ask! I think people are getting the Indy Six confused with the later 70s "stock block" aluminum V-8 based on an AMC engine.
Nope, not Budweiser cans, Foster cans. I had my sticky fingers on the actual Indy motor at the auction. It's cast iron. Quite certain of that. It's definitely a stock-based Rambler factory block. Head too.