The C6503 (C60 with 175" wb) Cab and Chassis has a curb weight of about 5600 pounds.
Not seeing any picture of your truck you'll need to figure out the bed weight. Does it have stake sides (all wood or wood and steel and how tall)? Does it have a hoist? Does it have extra steel for a tow hitch? Since it's GVW is 14,000 I'll throw a dart and guess it wouldn't weight much more the 7500-8000 pounds.
Mike B
