360 flywheel

You can purchase a new flywheel for your manual tranny car right through Mopar Performance. The diameter is 10.5 The 11 isn't available from MP. Other places like RAM or McLeaod (sp?) have 11 inch flywheels.
Use a damper for a 360. Then theres no issue.
The 10.5 is the one you need. Theres no tooth issue ethier.

For a auto tranny car, you can purchse weights to fix the balance problem or a part from TCi or other trany places that will do the job without welding weights on. Then any converter can be used.

All parts can be purchased new and also explained in the chassis book.