Dwell specifications by year and distributor number:
1110052: 35 degrees 1940 pass car
1110090: 38 " 1941-48 pass car
1112353: 34 " 1949 pass car
1112353: 34 " 1950 pass car
112362: 34 " 1951, JJ & JK engine
112363: 34 " 1951 2100 engine
1112362: 39 " 1952 2100 engine
1112363: 39 " 1952 2100 Powerglide engine
1112389: 38-45 1953 "conventional" engine
1112388" 38-45 1953 Powerglide engine

My 1940-54 Motor manual does not list truck distributors, but apparently dwell specifications between 34 and 39 degrees were pretty common.
Jerry.

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