Put the 360 & tranny on the V-8 K-frame, and drop the /6 & tranny on its K-frame. Then load the 360 setup into the car. He could put the /6 in the V-8 donor if he wanted. I put the V-8 in the Demon from down under and will never go over the top again if I can help it. It's easy, and I did it without any help.
One thing to consider is that steering columns have to be swapped if one is power and the other is a manual steered car.