I don't know the value of my 68 AMC Javlin
There's no hard number to be told. It's worth whatever someone is willing to pay. It's sort of a rare car with a lot of improvements so it shouldn't sell cheap.
Closer to original condition and equipment (numbers matching, as sold in 68) the higher the value. Swapped out motor, customized re-fitted to individual's preferences would dramatically reduce value. Seriously nice looking, solid straight body, engine & trans rebuilt: pricing has been hitting between $10-$15 typically. Exceptional all original cars, with historically correct restoration can bring as much as $25-$30. Concourse Javelins, if there are any, value would be set by the market venue. The pic is a upper 20K car