[Lee]

With the VA system, you will lose the ability to have fresh air (vent). The evap & heater core are both inside the case, along with the blower motor, it just does not have a way to bring in fresh air.

On my '73, I installed a Sanden compressor, parallel flow condenser, new drier, POA replaced with a pressure switch, and new hoses. I removed the stock evaporator, flushed it, pressure tested it, and reused it.

I got a lot of the parts, and great advice, from Classic Auto Air out of Florida.

Oh, there are two compressor mounts for Sandens on Pontiacs. One is 3 simple pieces, with the pivot piece mounting on the bosses of the side of the head, using both bosses. The other is 2 pieces, with the part mounting to the front of the head has two plates with spacers welded between them, and a variety spacers and bolts. The second version only bolts to the forward boss on the side of the head (and I had to elongate the hole to get it to fit, as it was drilled about 1/4" off.)

I've installed BOTH versions. VA is currently providing the second version with their Pontiac kits, but used to provide the 1st version. For me, the FIRST version works better, I believe all three pieces are Pontiac specific.

I suspect the 2nd version uses 2 Pontiac parts, but one "universal" bracket. I had to remove the valve cover in order to get the belt on (compressor hits the valve cover, even though there is nearly a third of the adjustment "groove" still left. Even worse, at around 75-80% of the adjustment, the bracket "cams over" and you LOSE belt tension.

The bracket kit I like looks like this one: https://www.ebay.com/itm/Pontiac-350...53.m1438.l2649

This is the 2nd: https://www.ss396.com/part/VA-141001-PPA.html