I don't have the stats in front of me but this doesn't make sense. The HO engine was not rare in 68, I think over 10,000 or 1 in 8 cars. So you'd expect there to be a few hundred HO cars with chrome noses. 16 sounds more like what you'd expect the number to be for RA cars with the chrome beak.
Sorry about that. Stand corrected. It is only 16 Ram Air 68's with the chrome beak!