With the inspection plate off the bottom of the clutch/flywheel housing, have someone depress the clutch pedal all the way. Then pry the disk away from whichever side it is sticking to. You should see the gap on the free side.
A small flat tip screwdriver should achieve this. You will likely have to turn the flywheel and pry it in a couple of spots. You may have to adjust the peddle for maximum travel to get this to work, and you'll have to remember to re-adjust the pedal for freeplay afterwards.
I have seen stuck clutch disks before, usually from water submersion, but also just from sitting. If you were to disasssemble the whole clutch, you would be surprised how little it has to stick to be siezed.
Not being a chevy man, I'll assume it has the inspection cover on the bottom of the housing. If not, you have to do all the work through the little drain hole on the bottom of the housing.
Good luck!
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