Here is an Ebay auction for a used Motorcraft Hipo distributor by Ebay member "hansens" with a Buy-It-Now of $489.99 or make offer:
This is a Fomoco/Ford dual point distributor, number C5OF-12127-E. It spins well, and looks pretty good. Could stand restoring and new tune up parts. see pics
1965-1968 Ford Mustang SHELBY GT350 DUAL POINT DISTRIBUTOR C5OF-12127-E HIPO 289 | eBay
-Fred-