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..