I installed a new RAM Powergrip HD complete with their billet steel flywheel just before the winter, drove it for a few day, and then the car has been in the garage until now when the snow starts to clear.
The scary thing is that the clutch engagement point is just as the pedal nearly is completely at the top/up position. I get some chatter and then I can move the pedal about half an inch(10-12 mm) or so.

I have gotten the TICK Mastyer cylinder, and the updated GM slave 2001+ in my T56/MN12 LS2 swapped Iroc.

What could be the reason for this? The car drives, but it feels like as if the clutch is totally worn out

I did not use a shim behind the slave.