Have a 598 in a 68 chevelle with a F2 procharger running 24 pds of boost. Running E98 Ethanol and am confused about Air/Fuel or Lambda for wideband to be "safe" with my tune. I have had a number of responses but very few from people who are tuning for forced induction. I believe that a lambda of .7 would be safe. Any info would be greatly appreciated.