Swapping 72 360 Truck Engine Into A 65 Slant A Body?

I guess it's an easier swap (Parts finding wise) coming out of a car rather than a truck.
besides the oil pan, which you may or may not need to swap on the car motor anyway, it's all pretty much the same.

maybe you get lucky on exhaust manifolds with the car, but likely not. so you're in the same boat as with the truck junk.

the swap hinges on three things: oil pan, center link, exhaust.

the trans fitment is just pound to fit paint to match as long as it's not something goofy specific application wise. and the motor mounts are gonna be the same in that you'll need to source a-body ones; which again, maybe the car ones might work but the truck is fairly unlikely.