Here is an Ebay auction for an NOS C3OZ 6306 A Hipo crankshaft sprocket by Ebay member "flyingfred" with a Buy-It-Now of $200.00 or make offer:
This is an NOS Ford Mustang, GT350, Cobra and Fairlane crankshaft timing chain sprocket for all Hipo 289 Ford engines. It fits all 1963 63 1964 64 1965 65 1966 66 1967 67 Ford Hipo 289 engines. A very tough piece to find. Doesn't your classic Ford deserve the best parts? Genuine Ford! Made right, Fits right, Lasts longer.