Need Help With Flywheel Thread

No way not happening. Going to Heli coil all 6 bolts. The flywheel is 52 years old. Should not be a balance problem if I do all 6. DO NOT want to drill out pressure plate.
You don't need to heli-coil all of the holes to prevent a balance problem. Heli-coil the bad hole......there will be no balance problem!