Have a 65 also a 66 Hertz both hipo cars. The 65 is a punched thru hole. I am the second owner of the 65. Purchased In 1973. The 66 clearly has a different hole. Not sure of the process, but does have an area towards the bottom that looks ripped You can see in the pic. Read an article years ago maybe in Mustang Monthly and they mentioned punched holes. For the choke. The Hertz looks like it could have used a hole saw and it ripped the bottom of the hole. Some holes may be 7/8 but my 66 isnt that big.