These kits can be used to convert Holley carburetors which originally came equipped with manually–operated choke or automatic/electric operated choke.
Fits carburetor's with "external" vacuum source (Model 0-4412, 0-4776-2, 0-4777-2, 0-4778-2, 0-4779-2, 0-4780-2, 0-4781- 2, 0-6299, 0-6708 and 0-6709).
427-45224 Instructions (PDF)