Welcome to Stovebolt, Firebolt!
According to the VIN Buster (located in the Tech Tips), your truck is a 2-ton built in August of '46 at the Janesville, WI plant.
You ought to check out the Firebolt forum in the Big Bolts section -- those guys should be able to give you a ton of advice and help.
As for parts -- check out the Links section for parts for the "truck" part of your truck. Parts for the "Fire" part will depend upon who made the pump/body for your truck. Lots of stuff is still available, even from those manufacturers who are still in business. Check out the Links section for those sources, too.
Oh yeah, there's a pretty good article in the tech Tips about
restoring a Firebolt, too.
Welcome aboard! Now show us some pictures!
CMB