How much would a running 1978 buick lesabre go for?? how about a kinda old rusty 1968 barracuda??

The Buick has minimal value, it's a smog era boat. The Barracuda, what engine, what bodystyle, how rusty? Need more details on it before telling you a value. Same with the Buick, but the Buick, maybe only $500-$1000..not a valuable car.