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First the clutch - the pedal is SUPPOSED to have free play.
Unless you have a manual that says different, I use 1/2 inch.
Free play is necessary to insure that the clutch does not slip at high speed. Having no free play is like keeping your foot on the clutch pedal all the time.
Your car was not designed to be shifted on stands - the wheels do not spin properly. Probably, the wheels slow down between shifts, whereas they keep rolling at the same speed on the road. The engine may be going faster than the wheel speed - I do not think that this is good for shifting.
As for overheating, perhaps you actually blocked some holes that you did not see with the gasket in place.
The gasket should fit perfectly. Did you keep the old one? compare the new one to the old one.
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