Duster Shakes on take off

Have someone get eyes on the rear section of the leaf springs; I bet they're vibrating like a bass-fiddle.
Put some clamps on them and try again. If that solves it buy some better springs, to manage that clutch.
You could swap out the clutch, but what's the point of that? A $700 door stop? I don't think so.You just need to control the torque delivery. If your left foot can't do it, stiffer springs will.
After the springs are upgraded, you may find, it still chatters, and then that would speak to a problem at the disc interfaces. You may have damage in there or just need more break-in time.
But if the springs are not vibrating, Then I would inspect the friction surfaces, and probably swap out the disc.I like the organics for my 367HO. They don't last as long as a CFII say, but are much more street friendly.I found the factory 340 disc, and the CF diaphragm PP a pretty good compromise. Just be prepared to replace the disc every couple of years when the springs pop out of their pockets,lol.And drag-strip neutral drops will split the spring pockets pretty quick. Or peel off the linings. So like I said street duty is fine even with 295s