Early Slant Six A/C Success
Great result. Sorry, I misunderstood your clearance issue. Slants are tight up front. Notice that they cast the water pump housing into the block and offset it to allow pushing it back, so the outlet hose has to go upward into the bottom of the head. They also made the crank damper serve double-duty as a crank pulley. The AC pulley even bolts inward of the damper. In small blocks, the damper is flat and all pulleys bolt to the front of it. I agree that early A's have even less room. I don't think any early slant A's had a clutch-fan. I couldn't even fit one in my 1965 small block Dart, after I changed to the later aluminum water pump (1" thicker).
I assume you realized the 60 A alternator by switching to a 1970's square-back one, since a direct bolt-up other than grounding the extra field terminal if you keep the original Vreg. I do recall old upgrade kits for the earlier round-backs. The original round-back in my 65 Newport has always kept the battery charged, even w/ Holley fuel injection and an AC under-dash blower, but I don't have an electric radiator fan which is the main load.
I am currently fabb'ing custom brackets for a Sanden compressor for my 64 Valiant. I'll post when done. It bolts to the power steering pump pad, which I see your kit uses to ground one of the struts.