Jon,
isn't there just 2 types of collars and flywheels for the 75-83 Z's, one for the 2+2/turbo(240mm) and one for the coupe(225mm). So the collar and pressure plate has to match the flywheel(Actually a clutch pressure plate from a 225mm flywheel will not bolt to a 240mm flywheel , but the actual trans doesn't make a difference. Bottom line is buy a clutch kit for the right flywheel. I just found this out the hard way by giving my machinist my 2.4 flywheel instead of the BWt5 flywheel. Guess what?, the original-clutch won't work so I have to buy a new kit-so much for saving a buck