Did a Bit of Tuning Tonight.....

I live at around 4000ft and some times my Dart acts up on me above 3000 rpm. I put a carb spacer on it and it has not done it sence. It has allways run good down the hill though. One time I was down the hill running at 5500 doing 120 mph. But up here in the hills it acts up some times. Sorry I have not found out why yet. But for some reason the 1/2 inch open Penolic carb spacer has been helping so far. I need to reajust the carb because I now have a stumble off of idle now. Back to tinkering. LOL