I would agree with the Pantera Performance fuel injection setup.
I did ask my racing partner to comment on this since he has some experience with Webers.
"The rule is that when running on higher elevations, make the mixture leaner by either making the air jets bigger or running a smaller
main(fuel) jet. What I do is have two sets of bleeder assemblys (holds both jet main/air & main/fuel) and swap. And, for every change in main (fuel is equivalent to 3 changes in 3 main/air)."
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