Chris - Here's some decoding based on your provided numbers/pictures:
Head - Should actually read "3836848" (casting numbers are notoriously difficult to read), 1956-62 235
Under valve cover - con 9 indicates the conveyor line assembling the engine / L 18 1 = Cast Dec 18th 1961 (not original to the block its attached to)
Flat by distributor - F = Flint plant / 0903 = Sept 3rd of the model year / A = Passenger car regular production 235 engine with standard 3 speed or overdrive transmission
Block by starter - con3 = conveyor line 3 on the engine build line / I 29 = Cast September 2nd 1959
Block by side mount - 3769716 is the block casting code for a 1958-62 235
So it reads as a 1959 passenger car 235 block with a 1961 235 head.
Hope this is helpful.
