Tom, If equipped with a inspection shield or maybe with starter removed through hole, remove shield and try prying between pressure plate and disc. On some old tractors they would pull the spark plugs and tow the tractor around in 3rd gear until clutch released.
HOW TO FREE UP A STUCK CLUTCH
Plan A: If you are car is pointed so you can lurch forward without hitting some object.
Step 1. Start engine in neutral and let it warm up thoroughly.
Step 2. Shut the car off and restart it with the car in first gear and your foot on the clutch pedal.
Step 3. Keep clutch depressed with left foot and blip the accelerator with right foot.
Step 4. Repeat as often as necessary to free up the clutch and then go for a drive. Let the clutch slip, so you can burn off the stuff on your clutch disc.
Plan B: If your car is in the garage, pointing at a brick wall.
Step 1. Secure the car, so it can't roll forward and hit that wall. Jack up the rear of the car (use the differential "pumpkin" as the jacking point). Support the car so that the rear wheels are up in the air and can spin freely.
Step 2. Start engine in neutral and let it warm up thoroughly.
Step 3. Shut off the engine, put transmission in either 3rd or 4th gear.
Step 4. Start the car again with your foot depressing the clutch pedal
Step 5. Rev the engine and hit the brakes.
Step 6. Repeat as often as necessary to free up the clutch and then go for a drive. Let the clutch slip, so you can burn off the stuff on your clutch disc.
Plan C: if all fails...get credit card, order new clutch, (preferably from us) start pulling out the interior and remove the transmission. If you have a BJ8, you should replace the pressure plate as well as the disc. In any case, spend the extra $5 for a spigot bush while you are doing the clutch job.
To prevent this from happening in the future, take your Healey for an outing ever so often. It is good for the car to stretch its legs from time to time. You can also try the trick of putting a stick on the clutch pedal so it is constantly depressed, but it is not a 100% surefire method.
Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
Chicagoland MG Club Tech Tips