What K members will fit my 72 Charger?

Too bad I'm not closer, I've got an 18,000 mile 225 coming out of my Demon in the spring that I'd donate just to see the little sixer cowering in that enormous engine compartment! :D

Yeah I know, I kinda want to put a little 6 in it just for the cool factor you know? It's kind of a rare duck, because it is an SE with hideaway headlights, A/C, PS, rear defrost, PDB, lots of options, but came with a six.