Hey II,
My 62 Chevy II had factory power steering and factory power brakes. When I rebuilt a 250 and had it painted (my brother used to own a body shop), I installed 4 barrel Holly 390, headers, HEI ignition and the AC.
I used and under dash evaporator from Pick and Pull. I got the compressor brackets from a late model 250 Nova and they bolted right up. Use the R-4 compressor; it clears the large HEI distributor just fine. It does not look ugly in my opinion. At least nobody told me that it was ugly at the picnic at Mickey Grove. Ugly is in the eye of the beholder.
I kept that car for several years and have the same system on my 235. They ran great.
Luis