How much is my El Camino worth?

People are lowballing me big time. I need money for rent but I don't want to get ripped off either.

Specs: 1985, v6 engine needs to be replaced, recently rebuilt transmission with receipt to show work, newer cd player with axillary input for mp3 players

Has significant body damage - one big ugly dent near the rear tire, some scraped paint, and lots of little dents. So it needs body work and paint. But I've drove it that was just fine until the engine blew out on me.

This car barely runs as it needs a new engine. So I don't expect much. But as it's steel and has some decent parts not to mention a fixable El Camino frame with decent upholstery, I figure the parts alone are worth a certain amount. People have offered as little as 300. So please, anyone, give me an idea of some sort of range I can fairly sell it for. My brother in law says the steel alone is probably worth more then 300.