d = 2 wheel drive/conventional cab
1 = 100 series 1/2 ton
3 = conv cab w/uliline, lo line wagon
b = 6001# to 10000#
e = 318-1 2v v-8
8 = 1978
j = tecumseh road truck (canada)
Made over to dads. He has the books
Curtis
P.S. Can you see if the tags on the rad support. Should be on drive side top. Partly under the grill. For the paint code. Should be a letter with 4 numbers after.