Eliminating AC & connecting heater only on a Slant six

I'm kind of curious how you managed to get only the heater setup without all the ac junk. My AC stuff is all gone from the engine bay, and I took the heater box out, and the vent assembly, but most of the rest is still under the dash. I was thinking I needed to just rip it all out and put an aftermarket heater in. I'd like to see a writeup on how to get the heat in without all the bulky ac stuff.