This intake is a 68-69, the modification is exact to the Vanke specifications. There is some rumors that the RO/WO cars didn't have them on them when the cars were new, but then they couldn't have had the cheater carbs on them either(carbs will not open because the throttle bores are to small) This is the second one of these intakes that I have had, the first was on a 68 hemi GTX that I had and within the paper work for the car was the reciept for the intake. The modified intakes were done on an exchange basis.