A Holley 3310-1 is approximately 50 years old. There is no way to know how many "experts" have had their fingers and drill bits inside of it. If anything has been drilled out then you are lost and need to get back to out of the box condition. Idle feed restrictions, power valve channel restrictions, Idle air bleeds, main air bleeds, emulsion channel bleeds, and kill bleed are all targets of the "expert" Mad Driller. Some times they know what they are doing and sometimes not so much. For sure they were not thinking 383 2 barrel when they got out their box of tricks. If in fact everything is untouched (unlikely) then put the original size jets, power valves, and secondary spring in it and it will be close for most engines. Fine tune from there. GM used versions of this carb from 302ci 290hp Z28s to aluminum head 396ci 375hp. Will it be optimal for a 2 barrel 383? Probably not. Can it be close enough to be drivable and not eye watering rich? Yes it can.

That said, The Ignition timing curve has to be appropriate before you worry about the carb. The factory timing curve is a horrible compromise dictated by early attempts at reducing emissions.