340 boat motor

We used to rent a small warehouse to store/work on our cars before we built the one in our back yard. It was in an industrial park here. For a while there was a boat parked in the parking lot there, and we checked it out. It had a Mopar small block with a 4 bbl intake on it. We wondered if it was a 340 or what. But couldn't look at the numbers on the block to tell. It may have been one of these.

They are cool. I never heard about these before. And that was way before internet and google....