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+1 on the wide band comment. Also this may go without mentioning, but re-check everything connected to the carb. Vacuum leaks can cause all kinds of problems, so check your brake booster line for any cracking or excessive wear, and make sure that your connections from the carb to the manifold and the manifold to the engine are properly torqued.
What kind of manifold do you have? I know you said the carb came from RB, and if the mani did too I guess it's a 2 piece? I have a 1 piece wraparound, but there is also one from Lake Cities or something that is really short, in which basically the carb is beside the engine rather than over the top of it. Is your vacuum advance from the distributor hooked up, or do you have it open? Also (and this has nothing to do with the carb's performance) but do you have the oil lines from the OMP hooked up to the mani? I don't mean to offend if you already know that this is critical to the engine (unless you're using premix). I'd just rather be safe than sorry when giving advice!
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