Maybe J 1 1 means October 1 1961 ?

F1017B in 1961 would mean:

F = Flint, MI assembly plant
10 = October
17 = 17th
B = Regular engine (235) in a passenger car equipped with a Powerglide transmission

I and 1, O and 0 often were often interchanged.

Tim
1954Advance-Design.com
1954 3106 Carryall Suburban
1954 3104 5-window pickup w/Hydra-Matic
The 216 and early 235 engines are not "splash oilers" -- this is a splash oiler.