I am unsure if what you want to do, with what you have, is going to work. Most cams specify that you use a four barrel and headers. You use a cam to open up your engine's ability to breathe but it can't breathe through a 2 barrel carb.
Ok, Holley makes a 500 CFM 2 barrel that will help but it is set very rich from the factory. You will want to drop the jet sizes at least two sizes and maybe three. About the best you will get is an RV cam or one of the mildest performance cams without restricting airflow through the carb and exhaust. You will need to recurve your distributor advance to help the engine breathe. Raising your compression will be a big help but I don't know how much you can gain by planing your heads and deck surfaces. Milling them for near zero deck to piston height is all you can do with the decks and I don't like taking more than .030" off the heads.
Anybody else know of anything more he can do within the limits of what he has?

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Paul
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retired mechanic after 35 years
specialized in Holley carbs and Ford Automatic Transmissions