What's my big block 75 Duster worth?

Yeah - the easy stuff was done - the engine was dropped in place. It looks like car I'd value around $12-1500 as it sits. Get it driving with all the major components right (like a factory fuel tank/sender/lines, an 8 3/4, and a driveshaft) and it would be more of a $4-5K car with imperfections but solid.