Ive heard from a few guys on the oldgmctrucks website that reported better fuel mileage when running dual carbs. I cant remember if I read that here as well...

Check out the links section. Theres a bunch of good vendors that sell all sorts of parts.

I prefer these guys for most of my stuff;

Chevs of the 40s

Jim Carters

The Filling Station

My 1953 Chevrolet
1947.1 Gallery
1972 C-10 1/2 Ton & 1972 C-30 1 Ton