Daniel,
Apply the emergency brake gently and slowly to stop the wheels from spinning. Do not use your hand. We don't want you to lose a hand, if the clutch disc is frozen to the flywheel or pressure plate. How much free play is there at the pedal when you depress it with your fingers, until the resistance increases? This is checking all of the parts at the master cylinder end. Can you move the clutch relase lever, item number 6 in Moss's online catalog into and out of the transmission, across the car? If so, the bushing item number 7 may be missing. If you determine that the clutch disc is frozen to the flywheel or pressure plate you may be able to free it up without removing the motor.
Put the car back on the ground.
Warm it up in neutral.
Shut the engine off.
!!!In a safe area where you can't hit anything!!!
Put the car in gear.
Start the engine. You will now be moving.
Hold the clutch pedal to the floor.
Stomp hard on the brake.
This worked for me in a large parking lot that was free of cars and anything else I could hit.
Phil