Marine 360?

Sure sounds like it. As for the bare block, there are no differences that would stop you from using it. The crankshaft is an entirely different animal.
I've been wrong many times before but I believe the crank is the same except that it may not be drilled for a pilot bushing the main difference on the short block is in the camshaft so the block is the same for marine or automotive use check it out real good was it used in salt water or froze due to no antifreeze