I've got a '49 that looks nearly identical to your truck, same condition, same colour, but mine's got the long bed and it's been partially disassembled by some well meaning but none-too-clever previous owner.
If it's no trouble, would you mind taking some more pictures of the truck to aid my reassembly? I can find loads of pics of Chevy's but the GMC's are fewer.
Areas in particular that would be helpful, (because they're in pieces) are:
- the radiator, especially the upper and lower supports and brackets
- the underhood wire routings
- the carb linkage/throttle and choke cables
That's more or less the worst of it, I'd really appreciate it. In return, have a look at mine if you're interested, although it's already in the gallery.
http://www.flickr.com/photos/fourtonnemantis/Cheers!