The trucks have a pretty good front end as it is. With adding the tubular components you'll have better ground clearance in the front end and less flex compared to stock. Also, the tubular a-arms allow more caster adjustment and use an interlocking bushing/cross shaft design that is a much better setup then the stock greasable cross shafts.

With the rear; the trailing arms being tubular are alot stronger and no flex compared to the stock arms and with a lowered truck using the cross member you will not drastically change your pinion angle when its all together!

All and all it is worth the investment. On a truck like this that has factory independant suspension you want the travel of the front end unlike a mustang II. Mustang II's are great with the early haulers but not right for the C-10's.