looking at doing a Gen3 swap ???

1) which is the better to get 5.7 or the 6.4 ?
2) truck or car eng?
3) short block from a car or truck?
4) heads from truck or car?
5) intake from a car or truck?
6) trans from the car or truck?
7) pcm from a car or truck?
8) which holds up to more power the auto trans or stick shift?
9) any certain year model better then the other?

if you had to rebuild the complete engine is there manuals with torque specs and such for these engines?

I think I covered all the bases