do you mean no one. I was confused at first by the body comment. anyhow yes. if they are 40's they should have the regular 5x5 1/2 bolt pattern if they are the 39's they would have the wide five pattern. still usable but not as many wheel options, just the 36-39 ford wheels, I like them but most people don't run them. if they are 39' you can swap on later drums for the 5x5 1/2 pattern. good luck
Yes why not? Its more or less the same as type the 46 brakes. Nowadays everyone goes to the F1/Lincoln type that is a better construction. But the old type has worked for decades, And in a light Highboy they would work ok.
I'll be using juice '40 brakes with wide 5 '39 drums on my mod. They oughta be good enough. I think mine will be lighter than a highboy though, so I'm not worried about poor stopping capabilities.