Heater & A/C control

Most of the aftermarket A/C mfg's use Sanden compressors & some sell kits to mount them on your Mopar. Bouchillon Performance makes a low mount a/c bracket that permits the compressor to mount underneath the alternator on an RB engine. You can update the under hood part or both. Most of these third party mfgs sell electronicly controlled evaporators that are much smaller than the OEM units & so take up much less space under the dash. But they still make vaccum & cable controlled units as well. Here are some web sites for a/c:

www.classicautoair.com

www.hotrodair.com

www.vintageair.com

Here's a link to a fellow's install of a Vintage Air system in his 64 Valiant, lots of info & photos...

http://www.slantsix.org/articles/vintage-air/Vintage_Air.htm