whats a slant 6 worth ?

Free-$250

Any slant I’ve ever tried to sell sat in my garage until I gave it away. I have only scrapped 1.

You can however break the motor down and sell a few things people are looking for and make some money. I’ve sold the head, exhaust manifold, valve cover, rocker shaft/assembly, the triangle washers and special brass nuts/washers for the manifolds.

Your best bet is pick a price you are comfortable with, and post it for sale. If you don’t have any luck just keep lowering the price.