Misfire at cruise, popping/afterfire at 3000RPM

Unfortunately I don't have the old distributor, I donated it to a member here. Kinda wish I didn't now.

The engine didn't run any better or worse with the rear carb disconnected, nor any different with both outboards disconnected.


I didn't check rotor phasing, because I ended up with a new distributor.
As you know, new don’t mean good. I’d check the new one as well.