[bret]

Yep, I've got a TCP power rack in my 69 Mustang since about 2005. No problems.
TCP uses a Woodward servo that has all kinds of feel and bias adjsutments for those who are so inclined.

We just did a 66 Shelby clone with our Tru Turn on it that uses a Borgenson box. It is very nice as well...the car drives like a Mercedes!

If you have the budget and want to tune the feel of the sterring, go with the TCP. If you want to bolt it on and forget it, use the Borgenson box.

I have researched a few of the other R&P conversions out there [as in actual installation and use]. They ranged from adequete to dangerous.