A/C questions on '66 Valiant 100

The RV2 is very rugged, but is a beast. Chrysler put thicker torsion bars on AC cars to handle the extra weight. The Sanden radial compressors are much smaller, lighter, and more efficient. However, after-market brackets are >$100 and you might run into pulley issues. All hot rodders use them and you can find much info on sites like HAMB. I have a "shorty" Sanden I hope to put on my 273 before next summer.

R-134A shouldn't hurt your compressor if you use the right oil. I converted my Newport 383 to Duracool years ago, and works great. It has the common York aluminum compressor, a lighter option to the RV2 if you can find a junkyard bracket. Duracool is a butane mixture compatible with R-12 oils, but the EPA fought it for years. Strange since I understand R-134A is now "bad" and Europe now uses butane.