340 Chugging instead of Reving

Rat Bastid said
That carb is black. That’s a reversion issue. Did you degree the cam? I had to ask but that’s bad.

Also, if it has so much fuel going through the engine that it blows out of the plug holes, you need to get some fuel out of it pronto. You’re killing the rings.

A 72 jet doesn’t sound outrageous but it’s getting fuel somewhere.

I can’t hear what you’re hearing but being pig rich will make them pop and bang and miss.

The carb was loaned to me to see if the problem would go away. It came to me black.

I did degree the cam but it was 1* off so I decided not to order a keyway, just break it in dot to dot and get some track time to dial everything in at another time.

I agree on getting the fuel out. I only run a few minute test or two then remove the plugs, air it out for a few days and lightly lube before trying another test.