I asked the manager at a local NAPA and he said no to me going thru their inventory too. There was a local auto parts store, I think is was "Auto Parts Club" (no longer in business), and you had access to the "store room". It was great. I got a couple of 65-66 distributors for 289 4V MT and AT engines, a 4100 for a 65 AT and several alternators. The problem today is not access but the poor quality of the exterior of carburetors, distributors and alternators - the rebuilders bead blast them clean, removing most of the part numbers or other details. Most of the counter guys say - "Well, it'll work." They have no concept of original.
Jim