3769716 = 58-63 235 block casting code
3836848 = 56-63 235 head casting code
You'll need to post the head and block date casting codes to find the years/dates.
F072IJC
F = Flint, MI
07 = July
21 = 21st
JC = 3100-4000 series truck with RPO-227 (11" heavy-duty clutch? maybe someone can confirm that RPO # and what it refers to)?
B21 848850 - no one has provided a reasonable explanation of that code?
