Here is an Ebay auction for a pair of used C7ZE heads by Ebay member "acond" with a Buy-It-Now of $2,289.00:
This is a near flawless very low mileage pair of 67 HIPO 289 cylinder heads which are correct for HIPO 289 engines for the year of 1967. They will work fine on 1965 and 1966 HIPO 289 engines but the date code and lower casting numbers will not be correct. These heads have been inspected and are crack free and in unbelievable super nice original condition. Very low mileage, no corrosion no machine work and no damage of any kind. The valve guides are good and the gasket surfaces are good. All original! If I were using them, I would just lap the valves to the seats and then use them. These are extremely rare HIPO heads with the C7ZE casting numbers on the bottom. Correct numbers for 1967. These are correct original factory assembly line installed heads for 1967, not to be confused with the later incorrectly marked Ford service replacement heads. Would be perfect for a 1967 GT350. Matched pair with same date codes. I have had these stored in the garage for many years, but have no need for them, so would like to see them go to someone who can use them. Shipping will be by UPS, so no PO boxes please.