1972 Dodge Dart 4 Door with 28 Miles (Yep 28 Miles)
A stuck clutch is USUALLY not a big deal.
1 Start engine and warm up after fixing bad valve
2 Start car in gear, shift without using clutch to high gear and get up to speed where engine can develop some power, say, 50
3 Push in clutch pedal, floor throttle, if necessary floor/ release throttle a few times with pedal pushed in. Clutch should free up.
If not, probably will have to yank out transmission.
You didn't want to drive it anyway, didja?