Rough idle Carter AVS

It`s the original carb, just rebuilt.......didn`t run all that great before rebuilding but this is a new rebuilt engine now with new rings, bearings, cam, ignition, etc.. The more I read about the carb and tuning ,the more it points to a vacuum leak somewhere. I`m almost ready to change the manifold and carb gaskets out just to rule that out. The car has 13-15 lbs. of vacuum at 850 rpm and I`ve used carb cleaner and checked all the gaps for leaks with no increase in rpm.???