Clutch chatters

hey guys i have exhausted my brain thinking what might be causing this issue. The clutch chatters bad on take off, the flywheel was resurfaced,new clutch,new rear springs, drive shaft seems ok, rear end has a little play,don't know what else it could be? You guys have any ideas? The clutch is a stock replacement, i have had problems with the clutch chattering in my datsun but i know what it is. the clutch in my datsun is a racing clutch and i was told it might chatter and it does(which doesn't bug me i drag it alot). Think maybe the rear is twisting too much?