What is considered a good air fuel ratio at cursing speeds?

The fuel you use will also be a determining factor in where the AF falls.

Low-mid 13's is a bit rich in most cases for cruise. If it was in the mid 14's it would be better. The numbers I mention are all based upon straight gasoline... NO ETHANOL! If there is ethanol present, the numbers come down.

I do know some guys that are cruising with AF's in the 15's with carbs. Here's a thread over at slowparts... Enough info to make your head spin... LOL

http://board.moparts.org/ubbthreads...=QuestionAnswer&Number=6495361&page=0&fpart=1

Another place to read is the innovate site for tuning help.
http://www.innovatemotorsports.com/forums/index.php