Welcome to the stovebolt, Stewart. You can find answers to your questions right here on the bolt. The Advance design 55 1st series is a nice truck, like the one piece windshield, and parts are available from many vendors.
Since this is the Welcome Centre, which doesn't get all the traffic the other forums get, my best advice, even though you did not ask for it, is to post your questions in the most appropriate forum. Engine questions in the Engine Forum, body stuff in the Paint and Body Forum, driveline questions in the Driveline Forum, so the guru's in that particular area can give you some great advice.
For those "modifications" you may even check out the HiPo Forum.
Not sure where Callaway is located in Md. but you need to know there is a Stovebolt Homecoming in Mechanicsville at John and Peggy's each April so put it on your calendar.
