3835253 was used on 1948-1949 216 blocks (car and truck)

1 26 9 block date casting code
January 26 1949

Engine Serial Number (truck)

GBA868672 \
GBA8b8b71 |--> the b and 6 stamp-tools might have been used "interchangeably" on the assembly line

G = 1949
B = 3100
A = regular engine = 216

86872-1000 = 85872 truck off the assembly line at that assembly plant in that model year