Buy whole truck or just engine/trans?

[68Green]

Im wanting to put a 6.0 engine and 4l80 trans into my 68 truck. I've been looking around at prices for just the engine and trans that are suppose to come complete with everything for a swap. I recently ran across a silverado 2500 that has pretty low miles (about the same mileage ive been seeing on the other engines) and its pretty much the same price as if I was only buying the engine/trans elsewhere.

My question is, should I buy the whole truck or just the engine/trans with accessories needed? With just the engine/trans, that saves me from having to remove the engine/trans. With the whole truck I have parts that might be missing if I bought just the engine/trans.

Just looking for opinions. Thanks.