I'd think mid 9's wouldn't be a problem unless something in the car is way out in left field. My small block made 703 on the engine dyno and 545 at the wheels on a chassis dyno. It's in a street/strip 69 Dart, 727,4.10 gears with 28" tall radials, almost 3300# race ready. It went 10.008 @ 134.74 in poor air, the 1/8 mile et and 60' was off by over .1 and the mph was down over 1 mph. It's been 6.25 @ 110 in good air.