I agree. This is what I can tell you. Early cars A or B Have never brought allot or should I say high market value.
Excellent early "B' cars that are not Max Wedge or Hemi will be in the $25K to 40K We never did better for a extremely clean big block B. Early A cars with Slants or 273 will fall in the category of $2500 to maybe $12K depending on how clean or modified it may be. A early A with a 416 stroker will bring more.As stated above the market is not there like the 68 to 72 A body cars. Same for the 68 to 72 B body cars.
Some in the 66-67 B body cars will depend on power train.
When buying I always look to see what the car needs restoration wise. Is it complete down to the wheel covers or are items missing that will be hard to find. Stuff like that.
As ToolMan said show us what you got.There will be plenty on here that will voice a opinion.