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I'm in AZ at about 4000 feet (good old hot thin air most of the time). I've had a couple of modified engines that ran the best with no vacume advance at all (I ended up just putting a cap on both...

Initially, I think I would shoot for about 36 total in at about 2800-3000 rpm (it's hard to say what the truck will like, but I think thats where I would start.)

Also keep in mind that when you...

You don't mention how it ran from a dead stop before you changed carbs. If you dropped bottom end power after you changed the carb, chances are that is the first place you should look.

If it's...