High mount water pump body/timing cover???

The block casting is not referenced to any automotive blocks through 1982. The thing to watch out for with marine engines is that some were made to counter-rotate from normal practice. These were for twin engined boats to keep them from "crabbing". The counter-rotating engine will be found on the starboard (right) side of the boat.

All the same, all it takes to convert this engine for automotive use is a front cover change out to an automotive one, and a harmonic balancer that has corresponding timing marks. Change the cam and starter to proper rotating pieces (if it's a counter-rotating marine engine) and it's done.