Aha! Now we're getting someplace . . ONLY one bank is heating . . and . . . Which holes are the hottest?
Just a guess here, but I'd say you have a malfunctioning carb. Lean on one side . .
IF . . the engine (or Headers) on both sides heat equally, it's probably retarded timing (12-18°, that's a bunch) but only one side, that's fuel supply . . again, My guess . . and that might also depend upon the kind of intake manifold you have. That's why you need to look at which cylinders are the hottest . .
Heh, heh, just remember, as a "CONSULTANT" I have no responsibility for knowledge or outcome of the situation in which I've "Consulted"!