If you are going to use your 1 ton as a 1 ton, I would strongly suggest rebuilding the original. Those light weight IFS set-ups are for hotrods that never carry a load. Besides, who would want "Pacer" parts on their A.D. truck anyway.
Just my opinion, there will be many more to follow,
Scott
P.S. Welcome to the Stovebolt, I'm a relative new comer also.