My vintage air makes decent heat down to about freezing. Cooler than that I covered about half the radiator to keep engine temps up. I never saw a coolant temp over 200. Next year I'll probably cover all of it and see if I can get the engine a little hotter.
No insulation, no headliner, and...
Redline Land Cruisers has a really nice looking set of knobs for the vintage air setup.
Purely preference, but I can't stand the ones that come in the kit.