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You probably will not find info on that carb from Holley.
A customer of mine had a 1968 Cougar and he bought an Edelbrock manifold, and pirated a "Ford" Holley off an abandoned Ford van with a 351 in it. He asked me to rebuild the carb for him & install the intake & carb. I had a HE LL of a time getting info on that carb.... with no application to work from. I had to go to Ford to get the kit... it was $75... and that was ten years ago. Holley & Ford have an agreement... you can't get the info or kit from Holley.... only from Ford. Isn't love wonderful?
If you can convince one of the air-heads at your favorite auto parts store to actually look in a book (eeeegad... he'll have to think), he might be able to use the Ford number to come up with a kit for less than $100.
Tom, your not kiddin' just out of curiousity I even searched the ford resto sites and found a lot of 9510 Ford/Holley muscle carbs from the late 60s and early 70s but nothing like 8418...yep good luck :cheers: