Slant 6 to 318 swap, 72 Duster, Using 75 D100

I don't see how you could do this on a budget. I personally wouldn't buy the trucks unless you're planning on just using them.

There just aren't enough parts that swap from a truck to a car cleanly to be able to do this on any sort of budget. The bulk parts like engine and transmission can be swapped over, but it's the small things that don't swap that are going to price gouge you to death.

Do you need a different oil pan? Pickup tube? Dipstick? Transmission linkages? Transmission mount? Driveshaft shortened? Rear end shortened? Axles shortened? Leaf springs? Torsion bars? K-Frame or V8 adapters? Tires for the truck wheels? Master cylinder? Brake lines?

There's a lot of small and big things you need to do to make this work.

People can help you easier if you give more details on all the vehicles. Like engine, transmission and rear end for all 3 vehicles. We have some of the information but not enough to let you know exactly what you need.