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I have the same problem with 1 of my 360s. Been chasing the problem for a few years. Still haven't found it. Done heads, cam, lifters, valve springs, carb., new dist., fuel filters, checked exhaust for blockage, and still have not found the answer. I'm out of ideas. Other motor runs perfect. I still need help.Ran fine last year. Went for ride and cannot get both engines over 2800 rpm at full throttle. Help any suggestions would be appreciated.