ENTDOC Ditto.....
Supply and demand, if you want a FIA hybrid car it will cost you as much if not more than a 427 car. A FIA or slab with TL will even fetch a few more Barbara Bush's as again there are fewer examples available.
Yes a 302 can run in excess of $20k however most do not! For 5-6K you can have a nice Weber powered 289/302 SB. Like anything else it depends on the budget and parts involved.
Why would CSX3020 be more valuable than CSX3156? Supply and demand and 3020 has history 3156 is a street car w/o history!
How many KMS 427's for sale? Guessing 8-12 at any given time.
How many KMS 289's for sale? Guessing less than 3 between FIA's and Slabs.
How many painted? Even less........
