its not the price that's the problem, its the information. These cars are a niche market & people know them & specs very well. People want to know what they are getting for the 20k.

Basic information you need

Engine spec: what block & spec?, standard internals? what head? is the head modified, what spec turbo? when was the engine last rebuilt and what was done on the rebuild.

Transmission: standard gearbox's & diffs? what clutch, how many miles or when was the box rebuilt?

Suspension: standard, uprated?

Bodywork? rust? rot, anything that needs doing?

I've only scratched the surface, this is just some of the information buyers of this type of car is going to want to know.