Engine identification

Need some help, I am trying to find out where the engine ID number is stamped on a Oldsmobile V8. The engine is in a boat with a Berkeley jetdrive. I am guessing that the engine would be 70's vintage. Need the info to order some parts.

Any help would be appreciated.

Thanks ahead of time!

in front of intake manifold on block is where its at

big olds engines have letters in the lower left of the cylinder head like a J. small ones have a number then maybe a letter like 5 or 5A