[bobcowan]

3,500' change won't really matter. Just put a nice conservative tune at home, and don't be afraid to drop to 0.

Going from near sea level to above 7,000' ASL means the engine will be running fat. For short jaunts, that's not a big deal. But for longer trips it will eventually foul the plugsCars can be hard to start up there, too. Iv driven behind people who live in Denver, and then drive up into the Rockies. Man, that stinks! It can really gas you out. We try to put EFI in the front, and carbs in the back.

If you're concerned about it, consider EFI. If programmed correctly, it will adjust for altitude on it's own.