I'll try the decode but I am not well-versed in this (check your email)
F = COE
35 (350x) = 2 ton
4 = 179" wheelbase
24 = 248 ci engine
P = Pontiac, MI production plant
6292 = sequence number (serial number = 6292-1001 = 5,291th of this model truck off the Pontiac assembly line that year)
To find the year, I think you need a chassis serial number (
which I think is found at this location).