E=1946 or early 47 model years.
C=Conventional cab
300 is the model number while the 3 is for a 160" wheelbase
The serial number doesn't say much.
13K weight is a 1 1/2 ton.

It could have a 2 speed or most likely a single speed, won't know until you look.

The standard engine would be a 236. If you scrap down the flat pad by the distributor, you'll find the engine size followed by a serial number with more info about the engine.

Jeff


My 1953 Chevrolet
1947.1 Gallery
1972 C-10 1/2 Ton & 1972 C-30 1 Ton