At almost 4,000 lbs and only 300 advertised hp, these 3rd gen Birds weren't rocketships even when new. Are you saying the car is down on power compared to what it used to be for you, or do you not have that history on it? Your compression is even, which is good.

Being that the car is used in hilly Denver, with thin air, I would see what ratio gears are in the back and go to some deeper ones. Some cars used to have what we called Western rear ends with high ratios for flat land, and they were pigs on hills. Maybe you've got a set of tall gears in back.

Whatever changes you make are going to affect gas milage though, so take that into account.

Don