You have not said a thing about the 3:55 rearend.The gear ratio will improve performance,but it will not change the horsepower of an engine.If you have a vehicle dynoed to tell you the horsepower at the drive wheels it will be a horsepower rating ,not an estimated horsepower.In other words,I took Bubba for a ride in my truck with 3:55 gears,and he said man that feels like 150 HP.Now thats an estimate.
