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as they figure it, your vehicle would need a minimun of about 423CFM at 5000 RPM. The carb section has some application info, but you need to look at your current app and see if you have a 2bbl or 4bbl carb. You can also call the sales line and they can make reccomendations.
There's also http://www.nationalcarburetors.com/, http://carburetorexchange.com/ and http://www.carburetorsdirect.com/ Once you know what part number and model, you can look for how to get it the cheapest.