No problem with that combo,except for a few details.Use 1967-72 front engine mount brackets,they go in the front set of holes in the frame.Get a trans rear x-member,even a later one will work with a little drilling.Cut the rivets and remove the rear engine x-member from the frame,you will not need it,and it will be in the way,they did away with them in 1971 anyway.The parking brake x-member in some of those older chassis winds up in the way also,so you will most likely set up the park brake cable equalizer like the 1967-72.Run disc brake spindles,rotors,linkage off of a later truck[70's-80's],ball joints go right into the earlier control arms.Dual master cylinder is a must,upgrade the cooling,and you might as well get a power steering conversion bracket from Rez or Chevy Duty and change that over too.
