Sorting Out Used Cobra's

[vegan2]

Is there any rule of thumb when one is sorting through all the available Cobra's on the market.

Specifically, let's say the body is from one of the top three (EM, Super, ERA). It appears that the engine installed is a really big factor with a 427 side oiler at the top of the list, 428 FE second and a whole bunch of 351 engines available but not bringing top dollar.

Do Cobra owners install 351 and other engines only because they cost less? Why would a Cobra owner install, for example, a Cheve engine is a Cobra? If you are a big block fan, is the dream really to own a Cobra with a 427 side oiler, but that dream may be way too expensive, so you settle for less?

In other words, what are the ideal Cobra elements within the big block group? What Cobra elements would be best to "own" when you want to sell? I'm so surprised at the level of Cobra availability, it's a little scary in that there must be 200 Cobra's on the market at this time - what is going on?

By the way, I'm a potential buyer and this is research.