go for a bit higher roll, most ls1's have this funky void of power zone between 38-44 or so. I dunno what the hell it is, but everyone has it around the same spot. Id say start higher and run till 120 or so. 3 and 4 are your money gears for your car. And yeah as long as u dont n00b shift you should have him. Make sure you run with about 1/2-3/4 a tank of gas too, youll have better traction if your running on street tires.