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There are many items, suspension and engine components, that were just not available when the C3 suspension was designed and actually being built from 1963-1982 that were just not available back then-one of them poly bushings. Others examples are stronger rear strut rods with heim joint ends, synthetic fluids, better tire technology etc. You get folks who say don't use a synthetic diff fluid because Eaton never recommended it back then. Well, synthetics were not around............does not mean it is not better now.
For the OP, it does seem that for those who have installed you have a positive response. I think part of this is the fun of toying with our projects. If that were not the case we all would not be buying a C3. I would say that for many of use, this is our hobby.