Purney,
There aren't too many things to blow on these old rigs. As you point out, the next suspect in the game would be the starter. It can be gummed up and can actually drag the armature on the field if the bushings have gone south. I'm not sure I remember this properly, but with a fully charged battery and good cables and clean connections, you can turn the headlights on and try to start the truck.
If the headlights almost dim to nothing and the rig cranks slowly, it's a battery problem...if the headlights only dim slightly and the rig cranks slowly, it's a starter problem. This is a shadetree test, and I might have it bass-ackwards, who knows.
Double verify the cables and connections and make sure the battery is up to snuff. A inexpensive hydrometer will give you a great indication of the state of charge on the battery, plus you can impress your friends and baste turkeys on Thanksgiving.
Stuart
