One jet size per 2000 Feet has been my experience. I live at 4500 feet and usually make an annual trip to see family that live at 200 Feet. To tune the car back to "normal" would take 2 jet sizes and taking about 2 degrees out of the timing.
1957 Plymouth (Hemi, Dual Quads, A833 4 Speed 9 1/4 w 4.10) Sold 1937 Dodge Pickup (Hemi, 6X2 intake, 46RH, Dana 60 w 4.56) Sold 1968 Plymouth Valiant 2dr sedan (354 HEMI, 46RH w/4.30 gears)
