[700rpm]

Before you do all that, check to see that the shims at the top of the flywheel housing are in place, and check your flywheel runout. If your flywheel has been lightened or resurfaced, be sure everything there is still in proper alignment. Also, chatter can be caused by a bad pilot bearing or main drive gear where it goes into the pilot bearing. If all those things are good, then consider the V8 clutch. Unless, of course, you just want a V8 clutch.

I've also heard, though don't have confirmation of it, that float-a-motor mounts can cause chatter.