63-66 a body ac options

My '65 Dart has factory air and it is a compact, well designed and made unit that provides heating & cooling for the defroster and fresh air as well as recirculated air (Max a/c). It's much more compact than after market units and will clear your console. They had to, as they were sold on '66 Darts and Barracudas. The hole in the firewall for the fan motor is larger than a non a/c car, so consider that as now might be the time to make that revision prior to paint. I've read in this forum that the wiring harness bulkhead connector opening is smaller in factory a/c cars, but I can't verify that as I don't have access to another early A for comparison.
I chose to replace the large, bulky and heavy piston compressor Chrysler used. It is power robbing and vibrates terribly. Converted to a Sanden style rotary compressor.