I recently purchased a 1969 Z/28 Camaro. It has a very smooth running 350 small block, original equipment engine in it, and a 4-speed transmission with Hurst shifter. It had the clutch replaced once awhile ago, however the car had moderate chattering in the clutch when starting from a dead stop, enough to shake the hood. I had the pressure plate, disc, and throwout bearing all replaced with new parts of good quality. The fork appears to be in good condition. I also had the flywheel resurfaced at a machine shop. The chatter was worse. I had the auto shop grind the flywheel again, and put another brand new heavy duty clutch kit in. The chatter has become even worse yet, much worse than when the old clutch was installed. It now shakes the entire car when trying to start from a dead stop in first gear or reverse, and when downshifting. I am at a standstill with this problem, I do not know where to go or what to do next. Anyone with suggestions, please feel free to e-mail me, or post a reply. Thank-you!!!!! Please help!!!