I also work behind the counter, (great job for a retired vet) and can tell you this is only going to get worse as time goes by. The generation that grew up working on cars, tractors, and trucks is slowly going away. As stated already Management feels that if you ask the questions that the computer prompts, anyone can sell car parts. We are a typical small town parts store, still have all the books, and refuse to throw out the old ones out.
The other problem is that without paying people to learn the trade, why would anybody stick around long enough to retire? You can say dumb kid, but without any training and decent pay, they're not going to stay long enough to learn the performance side.
Asking for a year, it is not a bad question, in the original post he said plugs for a SB Mopar, but not LA or Magnum. With all the resto mods out there, the year of the motor does become important. Also as we know, there is a hard break on parts for a 72 vs 73 and up.
Are there bad parts guys out there? Yup, we hear about the ORielys guys all the time, but instead of getting mad, maybe help the guy through it. Odds are the kid will only be at that job for a year or two, until they find one that pays better.
Ok, rant off, feel free to flame me
Mark