A Volarie or Mustang II front end seems to be a common mod to most of the old iron to upgrade the suspension and front brakes.
Not sure why some folks prefer the one over the other.. seems like you could rod either one just as easy, but i'm not a rodder.. so I dunno.
I've often thought that if I was ever going to upgrade the suspension and brakes in an old truck that the s10 longbed swap would be the way to go, and i'm positive it's possible.
They make a "kit" for putting '47 thru '54 trucks on the s10 longbed frame, and we have at least one fellow floating around on here putting a '40's panel on an s10 frame.. so why not a '40?