I sure hope it doesnt weigh 3900 pounds?If the car weighs 4,000 pounds with you in it and fuel,you might break into the high 13s if the engine makes 350 HP?
320 HP would be about the same times if the car is 3700 pounds total with driver. The 3.55 gear set will work well though ,if you dont add posi you will melt one tire until the spider gears escape. 2,000 stall speed would work well. Tires will need to be good quality.