spool type K frame

Lots of info found when I do a search and its confusing for me so Ill ask directly for my situation.

I removed a K frame today from a 74 dart sedan, ( 318 car ) I also took the torsion bars but Im not sure that they are any different than whats already in my 71 slant swinger and I took the engine mounts off the 318.

I am considering using a 70 340 and am wondering what info you guys can tell me as far as what I need to make these combination of parts work?

The car had no sway bar, Im gonna be on the lookout for one, should I have grabbed other components from the 74 sedan?

Someone had already removed disk brake set-up