To summarize:

Block: 3769925 A241 (Jan 24, 1961)
Head: 3836848 C40 (Mar 4, 1960. The holes were drilled in this 848 head.)

I take a considerable amount of time thinking before doing anything.

1948 3/4-Ton 5-Window Flatbed Chevrolet

34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.