The car is a 81 El Camino. Not sure on weight of the car. Motor is a 383 550 horsepower. 200r4 transmission with a 3000 stall.12 bolt rear. I am going to put on a set of et street tires 29.2 height.It is more of a street car then a drag car . For the question I have been thinking on using a set of 4.30 gears are these going to be to big on the street ?