A/C

A small compressor would be a Sanden. They come in two body sizes - H13 and H14-H16. I used the H13 "shorty" in my 1964 slant-six since from a former M-B retrofit and an H14 in my 1965 Dart 273. The H13 is used in Honda Civics, so "should suffice" in an A, dep. on where you live. It is ~1" shorter as I recall. I made my own brackets. In the slant, I used the generic $50 weld-your own type, using structural steel plate from Home Depot. Those give you the critical curved slots. I mounted it on the power steering pad of the block and secured to the R engine bracket hole. Insure you orient so the slots let you tension the belt. Later, I got Sanden brackets from a 1978 Volare slant, which also mounts a p.s. pump so might swap to that someday (comes very close to battery in early A). For the small block, I leveraged 2 brackets w/ curved slots from perhaps a Chevy and another engine. Don't know since they came with a used Sanden compressor I bought. I secured it to the water pump (using later alum w.p.) and an intake bolt (vintage aluminum). You can buy brackets for a small-block and big-block (Bouchillon Performance, others) and perhaps slant (sketchy if available and high cost). Prefer a 7 bolt Sanden (SD7) to the older 5 bolt type (SD508, I recall). You will also have fun with pulleys and belts.