hello my name is joey,and I was wondering if you could help me out with tuning a 1997 5.7 l31 all stock except headers and cold air intake.this motor is in a1971 chevy c20 and needs the gear ratio and speedo change.Oh and the rear o2 deleted,also where I live there is no smog check so maybe get rid of all the emissions;the truck runs but 8-10 miles to gallon with no performance sucks. MY EMAIL is joeyzam@Hotmail.com thank you JZ.