I have a set of the TCPs and intend to use them to adjust caster. I refuse to use that crude shim system that these cars came with. Kent (for whom I have great respect) and I discussed this prior to my purchasing them, and he recomended against doing so - but CJ Pony, where I purchased them, advertises them as being useful for that purpose.
I am also using the Pro Motorsports eccentric camber adjustment system. Again, the objective is the elimination of shims for alignment purposes. I realize that I'm doing a little pioneering here and hope it will work out well. I also understand that the experiment could fail, and if that occurs, I will be stuck with upper arm shimming after a lot of trouble and expense.
Regarding street suitability - the TCP rods have Kevlar ends, which are not going to be compliant like the factory rubber. No doubt the rods will transfer more "shock" thru the wheel and will take some getting used to over irregular road surfaces. But I'm thinking it won't be a huge problem, since one thing the adjustable rods are intended to do is to preserve suspension geometry and reduce binding under load. How bad can that be?
I don't doubt Kent when he says his alignment tech had difficulty getting it set up right, but a guy in my car club, who works as an alignment and brake tech, says he's done early stang alignments with both systems (the rods and the old shims), and much prefers the adjustable rod conversions on early cars. He is the one who recomended the eccentric camber plates, too.
Not having installed these things yet, I am only able to go on the information provided by CJ and this alignment guy. I am hopeful it will work as intended, but we shall see...