No cab or box suggests it was totaled from presumably a rollover. Do you have the computers for the engine and drivetrain?
What to do with it? For me the thing that jumps to mind immediately is a 4WD Corvair mark 2. Fixing it up to a proper truck would be quite expensive unless you found another 2500 or 3500 with a bad drivetrain to do some "Farmer Addition" with it.
The other thought is the V8 can be shoehorned into that Cutlass and turn it into a proper tireburner!