Hmmm....3.55s or ???

What is the engine? You want to be at about 4500 or so max in 4th at the finish line. using 90 mph, that's about a 3.91 or so. I wouldnt go any steeper if the engine isnt modified with better exh or intake/carb. Then work on the suspension and technique, because dropping the clutch and flooring it will spin the tires a little.