this should set you straight. I think your numbers are showing a much lower rpm than reality.
although florida is pretty flat but you have a couple of things to consider; elevation, style of driving habits, towing, road conditions, terrain (mountains vs flat).
I'm running a 292 in a 3100 w/T5 and 3.40:1
see:
http://www.stovebolt.com/bboard/cgi-bin//ultimatebb.cgi?ubb=get_topic;f=2;t=010333;p=1#000000
