Hi all. I have installed a late model 347 stroker motor in my 4-spd toploader 68 Shelby. I am using the stock z-bar set up. I used my stock 68 bell housing as well. I installed a Zoom diaphragm street/strip 5.0 clutch. Problem began with the throw-out bearing not fitting my 68 clutch arm, so I re-used the old one. Had trouble getting adjustment set properly. Clutch will not work unless I adjust "pre-load" onto the clutch, ie. throw-out bearing is in contact with the clutch springs. Do I need to change the clutch arm and go with the late model throw-out bearing? Can anyone tell me which clutch arm to try ? hope I explained the properly, and thanks for any suggestions from anyone who has tackled this issue.