Help identifing my truck

[dads66]

I have just bought, from a family friend, my Father's 66 C-20. Him and Mom rolled it off the lot brand new. I'm slowly starting to restore it. I need help in identifing the truck. I hear about fleetside, longhorn fleetside, etc. Any help would be aprreciated.

 

[bk65]

THe serial number contains the info on body style, etc. There are web sites that have that info or many of the folks here can decode the numbers.