hey i have a 96 f-250 crew cab short bed w/460 ,headers ,k&n filter ,4 inch exhaust , and a vortech sq 2 w/a smaller pulley .didnt change over to mass air because of the cost . had it dyno'd by some guys who arent afraid to ask for help .remember larroco had a speed density mustang in the low 9's so dont let that bother you . anyway it has 3.55 gears and 35's and put down 340 hp and 450lb tq at the tires after it was heat soaked w/only 6 psi of boost . didnt fool w the timing much just got the air /fuel safe its actually a little fat under full load because its my tow rig .i can get you there # if you want them to burn you a chip .hope this helps