[tubman]

Cast iron bell means truck and EAB means '52-'53 heads. EAB heads were the highest compression stock late flathead heads, and a lot of people swapped them onto other engines to improve performance. It is so common that EAB heads now command a premium if in good condition. Beyond that, it's a crap-shoot. Oher than a possibility of a Merc crank or later cam, all that really matters is condition. That means a tear-down.

Car heads and a truck bellhousing spells "hodge-podge" to me from the get-go.

You are correct that the two long bolts are used to mount the starter, and there should be a small bracket under the head of one of them that bolts to the block through the pan with one of the pan bolts. Of course you should use a new filter (and new oil). If the engine is any good at all you should probably consider removing the intake and pan and check for excessive sludge. If there's a lot there you should clean it out.

Good luck with it.