Cleaned up the intake on my 330 4bbl HC and it is junk. What would the recommendation be for an aftermarket, or would someone have a good used OEM for sale?

 

Define "junk". Iron intakes usually don't go bad unless you dunk them in salt water for a few years, or drop one from a great height. In any case, any aftermarket intake that fits an Olds 350 also fits a 330. The choice between Performer and Performer RPM depends on the mods to and intended use of your engine. Be aware that neither will support the divorced choke on the stock intake and carb, however.