Hello all.  I inherited a 1966 GMC C20 a couple years ago from my uncle.  He had purchased it back in the early 70s and used it as a welding truck for about 20 years.  I am starting the restoration process.  Actually pretty stoked as I got it running today.  
I already have a spare cab, doors, and fenders.  I'd like to put a bed on it, but it was originally a chassis cab truck.  I am guessing a long bed would fit, but I need to get measurements of a short bed and long bed to verify what I need to be looking for.