Constant or Ported Vacuum Source for Distributors? ...AGAIN!

They are becoming a issue for me also, NOS mopar are to much to have on the shelf, seem the straight arm is 440 points, but it is also on some 383? Confusing as hell to figure out in a listing.
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Hey Hoppy, I was looking in the '67 books at single point BB distributors. There was one non-CAP 440, high performance distributor with single points. Most of the others are Prestolite dual-points as you'ld expect.
FWIW, there's five 383 single point distributors and three different vacuum cans. I assume these were all the stamped metal style like you picture. Wouldn't be too hard to make any that fit work for hot rod..