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You can get A/C on a 67-72 so no need to go long pump for that. I would not use an A6 compressor, but there are kits to put a Sanden on which will have the brackets you need anyway. And if you do go serpentine, get one without an R4 compressor like a Corvette with Nippendenso or the later 4.3 or 5.7 with the silver compressor and then get a Nippendenso to replace it (not an offshore). With any of these you will need a different alternator and I would want a CS144 not a CS130.
https://www.classicindustries.com/pr...Gmph3crLtlBrGx[/QUOTE]
This is the set up I found yesterday that I was thinking about going to/using.