Here is an Ebay auction for a used C8ZE replacement Hipo harmonic balancer by Ebay member "auntiek351" with a Buy-It-Now of $244.44:
This is a good used original Ford Harmonic Balancer for a 1963 1964 1965 1966 1967 Mustang Shelby GT350 Fairlane with a 289 HiPo High Performance Special V8. This is the Ford service balancer with ID number C8ZE-A. It has not been rebalanced and has an excellent seal surface. This has very clear timing marks and has not been altered or damaged. It is clean and ready to install on your engine. Thank-you for looking. (021722)
FORD 289 HIPO HARMONIC BALANCER C8ZE-A SPECIAL HI-PERFORMANCE MUSTANG K CODE | eBay
-Fred-