Just for fun I called the Holley tech line. After I asked him he put me on hold for about 10 minutes. The only answer I got was "They were made from the late 60's to the early seventy's, and we didn't make a whole lot of them."!!
LOL :toothy7: Maybe your answer was outsourced too. If I remember correctly, they came on 427 Corvettes in the late 60's. Now I'll be digging through old issues of Musclecar Review to verify.
