Clutch Question-T18 Conversion

i have been having horrible problems getting my clutch to work on my 225 to t18 conversion...i basically have one clutch disc i got from napa long ago that worked, but the springs are broken on it, and i need to get another, i tried another one from napa but it wont work, like the clutch is not disengaging properly, i measured the thickness of the discs and found that the new one is slightly thicker?? ive tried the centerforce clutches too and they did the same thing. i was wondering what kind of clutch you guys are running on with your t18s, where you got them from and what the part numbers are, also i think the pressure plate is stock jeep and the clutch disc is supposed to be from an 80's mustang, is that right??? any particular year?? thanks for your help i need to find a clutch system that will work...

 

anyone else have any input, i would prefer something cheaper than the centerforce.

 

ok one more question, i have been researching through centerforce, napa and checkers websites and found that the centerforce clutch your running is from a 84-02 camaro. when lookign up the original jeep pressure plate is says it is a 'flat diaphram' and the camaro pressure plate is a 'raised diaphram.' what is the difference??