What is the rpm at idle now? Sounds like you have an auto trans. If so you would normally need a little higher idle rpm in neutral than with a manual trans because when you put it in gear the trans places a load on the engine.
A little higher idle rpm won't hurt, it shouldn't 'bang' when shifted into gear but it shouldn't stall either.
You say you adjusted the choke. There is also a 'high' idle adjustment that will run the engine at a higher rpm while the choke is on and engine is warming up. Also, to set the choke you normally need to turn the key to RUN, don't start the engine. Depress the gas pedal all the way down once and release. The choke should now be on and it should run on the 'high' idle setting when you start it. Turn the key to START then let it run until it warms up some.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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