if you use the frt and rear axles from a 70-71 chev they are a littls narrower than the 73 and up . they have disc brakes and the newer style p/s. also they have 5 stud axles in a half ton.
you could also use a divorced 205 t/case though you will have to find a pass/side drop.they were avail from dodges and IHC's of the early 70's
ron
just opens more avenues of possibilities