I have been reading all of this going on and I just want to say I lived in Cincinnati (about sea level) had it tuned for that. When I moved to Arizona (about 5000 ft. elevation) had to completely change the tuneup, went down 2 or 3 jet sizes and pulled the MSD distributor and my son did the mods to it, set the timing at 34 deg, 571 cu in runs great . Fine tuning is a big part of it.
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