Quote Originally Posted by nitrowarrior
From practical experience of living there and racing there (Denver/Fort Collins), I can tell you increased compression according to your cam selection is always a plus. A bit more lead in timing on stock motors was always a plus too. The biggest concern was getting air into the motor. Good manifold selection was critical and never reducing the size of the carb, rather work on the booster for sensitivity and getting the best selection for dropping the booster down as far as possible into the venturi. On injected motors we had to watch how close the nozzle size and pulse widths for best A/F ratios. It's all a matter of air in that altitude. Velocity being more critical than size and volume such as manifolds and induction.
Very well written.