[Spridgets] Jetting Weber carbs for altitude

[JLC]

Spridgeteers,

I can find a lot of online sites for rejetting carbs on boats, ATVs, bikes,
etc, but nothing relevant for LBCs. Anyone knows where I could find some
info? I have two Webers DCOE 40s which were jetted at sea level, but I am
now regularly driving at 6000 to 9000 + feet, and the engine is running too
rich. I know I should also advance the ignition.

JLC