Re: Guess what this is…

[Don]

OK, I’ll bite. Well the top arrow points out the the throttle cam/mag plate is way out of position, no way the engine runs like this. And yes, looks like the block is some sort of Frankenstein setup, a later model engine on the older midsection. There are two fuel pump bypass covers, and the recirc hose should be connected to the top cylinder.
This is what happens when we mix and match stuff, nice coat of paint on the powerhead though!