Industrail hemi

I had a hemi out of a boat, it seemed very heavy compared to other engines. I think it was a 331 but not sure. it came with a 24 volt magneto distributor and shielded sparkplug wires that screwed in on both sides. The valve covers said Chrysler marine. it had a huge flywheel on it with a u joint bolted to the center of it. I was frozen because two of the cylinders were left open and rain got to it, but the other cylinders still had the cross hatch marks and no lip. I paid $200 for it in the 80s and gave it to a friend in the 90's, he probably still has it.