I have a 1997 Mach 1, and also used a goodwin clutch kit for it early on, until I learned more about the TRA . It used a GP3, which was the same as a CF1 ( I've never seen the profile of a GP5), but this kit was a little slower than stock, but had good backshifting. I had contacted Goodwin about this, and they sent me some 280's, which worked better than stock. In my opinion, I wouldn't use the CF1's on a Mach Z, I would stick with the stock ramps or the 286's, depending on year of sled.
Hope this helps !
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