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See what size you have and go down from there if I remember they go down in two sizes 60 to 58 to 56 etc. Den

You can leave the carb on the engine to change the jets. Check a few cleaned or new spark plus to see how the change is working.

It's worth finding the cause not only for clean air but THE CAR WILL HAVE MORE POWER WHEN TUNED UP WITH THE CORRECT FUEL MIXTURE. Most guys just throw a carb on the manifold and it runs so they let it go. Spend the time to tune it and you'll like the car a lot more. Den

Pull a few of the plugs out and look at them this may tell the story. Holley carbs are very easy to work on. You can get the jets at about any speed shop. Maybe at Autozone to> Den

High HC readings are from unburned fuel. so look at the following 1.incomplete combustion 2. improper timing 3. ign wires 4. poor compression What was the 02 reading? This will tell you about you fuel mixture. High 02 = lean mixture, vac leaks or ign problems Low 02 = rich...