[twobjshelbys]

People put Paxton on the 289. Shelby put two on his 427. I don't think cobras except Shelbys were official but I know of a couple on 289 mustangs. Pretty low boost at 4-6 psi is about all you can do with a carb fuel delivery. A friend had one on his 66 gt350h 289 hipo and said it was noticeable