Advice on buying a '75 dart.

Take a floor jack and a jack stand or 2 with you so you can get under it and check the frame and floor pans. The rest of it looks clean, and the Lincoln seats...although kinda fugly, look very comfy! They fit well. It looks like it has a disc brake master cylinder, but it's hard to tell if it's big bolt pattern or not. The biggest thing you will be able to pick on it to get the price down is loss of originality with the seats and add ons. Maybe offer $4K and see how bad he whines.