Just learned that, indeed, you should advance timing about .8-1 degree for every 1000ft. above sea level. I'm at 5300 ft. so that would put me right at 8-10 degrees BTDC. So there ya go...
I read that 7-10 degrees BTDC on an MGA engine(4 cylinder, 1500cc overhead valve) will make it run better...so I set it that way and I think it's "happier"
You have to be careful of the idle speed as the auto-advance weights may be having an effect when you check the dynamic timing....no problem with static timing though....