This is the cast aluminum front housing on Ford Autolite starters. Researched here and on the 'net.
Know that the snouts with the extra ribbing started mid-1970's. There are big block (3 bolt) and small block (2 bolt) ones, also automatic and manual transmission (longer snout?) applications. Ink stamps into 1967, then Ford numbers stamped in the body.
I have found casting numbers on those castings.