halftanked is correct. There is no one gear ratio for all cars, but I've always geared so the car was almost or at the maximum rpms of the powerband right at the lights. You want the car to still be pulling rather than running out of steam.

With our 351 Cleveland, we geared 4:88's with a 29 inch tire. With my altered, I had 5;14's, with a 30 inch tire. You have to run the car and see what it is doing at the finish line.

Don