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There are classic car dealers (very few) and then there are other dealers. They're both in the business of buying low and selling high (hey, that's the American way!). The "other" dealers don't have to work as hard because their source of inventory is either from trade in's or from wholesaler's that are marketing cars that were traded in on new cars. While selling late model Vettes isn't much different from selling any other late model car, selling a classic car is much different. Instead of asking only "how much are the payments?" or "how many miles?", the classic car customer is likely to ask questions that are far beyond the knowledge of the typical late model buyer. Auto dealers are also very dependant on financing our cars (as well the fact that ripping you off on financing can be another source of profit).
Fortunately, there are dealers that are very knowledgeable about early Vettes and cater to our interests and concerns. Unfortunately, most of them are still "dealers' and aren't likely to resist an opportunity to profit at your expense.
I think it depends on the dealers. Some Corvette dealers I have worked with won't bother because in their words "thy're too common and too cheap". The dealer I bought mine from handled minimal C4s, but everything else, especially C3s.