It's my old boat anchor! Been wondering where it went. I'd appreciate it if you could box it up and sent it to me. I'll give you a sand dollar for shipping....
My guess would be Mopar Slant or Flat Six. The both have their oil pump assy on the pas side of the block. That ´s a true survivor with beautiful patina.
It's a rare Dodge inline 6 prototype for a Whack-a-Mole game, it didn't go over well so they abandoned the project, threw it in the ocean and started making automobiles. That's my story an I'm sticking with it. HRP