[blykins]

How much vacuum are you making?

Bill, I would agree that a lot of guys typically put carbs on that are too big. In this case, I think Jim is on the fence.

Usually, when the carb is too much for the engine, it shows lean as the engine isn't efficient enough and can't suck hard enough on the carb to produce a good signal.

In this case, he's possibly running a little rich, which could be just a jet change, air bleed change, or if he has lower vacuum, it could be opening the power valve prematurely.