Not tot to hijack this thread but I was wondering if you just replaced the compressor with a Sanden and used the stock condenser what kind of cooling could you expect?
Would it be that much better with a parallel flow condenser?
There's nothing magic about Sanden type compressors.You do need to consider compressor displacement. The RV-2's were a little over 10 cubic inches. The RV types used on /6's were around 9 cubic inches displacement. So, you need to pick a similar displacement Sanden.
R-134A is not as efficient in moving heat as the old R-12. Parallel condensers are more efficient than the older serpentine flow units and help make up for the less efficient R-134A. The early 1970's and late 60's Mopar systems were over designed to the point that even with the older serpentine condensers they seem to convert to R-134A well IF you use the original OEM radiator fans and shrouds to get a good air flow going.
By the mid 1980's systems were designed to save weight and money were designed right to the bare minimum. They do not convert well to R-134A without parallel flow condensers.