Very rare, 260 289 Ford Shelby Cobra, 289 Hipo Fairlane, 289 Mercury Hipo Comet, 260 1963 Sunbeam Tiger, Shelby Cobras back in 1963-1965 very nice distributor, vacuum advance works good, comes with made in the USA distributor cap.. the vacuum advance holdown screws are stripped..picture #18. I installed a longer screw and nut to hold it..picture #19..other than it works good.. it does have the 10L slot for better high performance.. please ask questions if you have any thanks!!.. it originally came also with a plug on the front of the vacuum advance..I installed one with a vacuum fitting in front if you want to run vacuum in it... can be used on 289 High Performance K- code 271 Horsepower engines as well..