[Argess]

Depending on your clutch linkage, remove all free play until the throwout bearing comes in contact with the pressure plate, then back of a couple of threads for about 1/16" free play.

The engine shouldn't get that hot that quick. What size engine is it? A big block usually gets to about 180-185 with a 165 Deg thermostat in it (sounds weird, doesn't it?) and take aa long time to heat up....5-7 miles of driving, not idling under no load. Also, 100C (212) F isn't terribly too hot, but the fact you got there quickly could be new engine break-in heat, or if you use a non vacuum dist, your timing could be not far enough advanced. You may also have air trapped in the cyl heads. Try to release it by loosening the highest coolant fitting on the engine. Otherwise, remove the rad cap and run it for a bit. The air will eventually come out and the coolant level will drop. Top up with coolant.