dpoltzer, I'm assuming since you said in your opening thread that the RA3 has a 'Stock' rebuild so it most likely has on 068-style cam and 10.0 (+/- a tenth or two) static compression. Steve 25 mentioned a vacuum leak and that is a good thing to double check as well as turning out the idle mixture screws half to a full turn to see if it still bucks. Do you know what your total mechanical advance is (such as 34 degress all in by 3000 rpm) with the vacuum cannister disconnected? You said your distributor is a NAPA rebuild, so who knows how it is set up and that needs to be checked and most likely tuned (recurved for your specific engine).
I should have said the bucking could also be caused by too much advance along with a lean condition in the carb. Lean-surge is totally carb related but can be exacerbated by too much advance in the distributor.
Happy Thanksgiving All!
Dennis
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