I am not sure about the 40% to 60% change either but it is an easy swap on the linkage.



""One more thing you may want to consider is decreasing the secondary MAB, instead of increasing the jet.""

I increased the size of the secondary MAB to keep my transition circuit active during my upper cruising speeds. My curve starts to go richer above 70mph so I want to keep the MAB's where they are. I don't mind the jet spread and I am giving it what it wants.
-----------------------------------------------

""Any thoughts on what could cause a light throttle miss at higher RPM?""

What conditions are your wires and distributor?
I wish that I could give you some help on this but I am not sure what to say.
Where did Jim go? Any ignition guys want to give this a try?