I did find dana44 on front, rockwell transfer case t-221.I did not locate any rear end numbers yet, thank you.
yours seems to be the std question for a lot of 1960 4 x 4 owners in that they have a rare napco 4 x 4, 1959 was the last year that they were supplied that way in k10 and 20 series. the 235 was the correct I6 eng for your truck. it was discontinued after the 1962 production with the advent of the 230 and 292 eng.
ron