finally found my super secret decoder ring!

E10 = Econoline pickup
T = 170 engine
H = Lorain assembly plant
496895 = January 1964 serial number (1964 model)
090 = wheelbase
J = Rangoon Red paint
E104 = 3/4 ton pickup (4350 GVW)
5 = red standard interior
87 = pickup body
A = 3 speed transmission
01 = 3.50:1 light duty axle (7-1/4 inch)
4350 = 3/4 ton GVW
85 at 3600 = certified net HP at RPM
33 = Detroit sales district


jim