Obsolete Chevrolet Parts Co.
www.obsochevy.com in Nashville, Ga. lists a 55-62 11" flywheel with 168 teeth (12 volt) part # 3789730 @ $175. if you can't locate a vendor closer to home.
Their number is 1-800-248-8785. I've never used them so can't vouch for their service but at least you've got a place to start your search. Hope this helps.
Dave
