One jet change rarely makes a difference that you can easily notice. That is why Holley always recommended making a 2 step jump initially.
Two Steps up then try one step back. Two steps up and one step back. That way you cover all of the jet sizes but the change each time forward is noticable. Same deal going lower for Altitude Testing. I personally would really dial in the center carb jetting to be spot on and then choose the 64 Jets for the ends and if you have no drive issues leave it slightly rich vs slightly lean. You do get decent air in Colorado occasionally.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
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