To review your numbers,
55F1017N..... Stamped on flat machined boss to left of distributor.
3733950....... Block casting number Right side, far forward, way down and under ledge.
1954-55 261 cubic inch
3836850....... Head casting number
1954-63, 261 cubic inch
J 10 6.......... Head date
1 27 6.......... Block casting Date,------ Is that a one (1) or the letter (I) or (L) ? It should be a Letter.
A = Jan.
B = Feb.
C = Mar.
D = April
E = May
F = June
G = July
H = Aug
I = Sept. 27, 195(6)
J = Oct. 10, 195(6) Head
K = Nov.
L = Dec. 27, 195(6)
6RW K 3844...Vehicle Serial Number drivers side body hinge pillar.
Serial #..... : 6RWK3844
Mfg Date... : November,1948
Model....... : 2 ton
Wheelbase. : 161 inches
Plant........ : Oakland, CA
