what rear gear to choose for road racing

cars under construction tryn to get the pieces n i thought about haven a couple pigs set up with different ratios, but engines a 440 (not rebuilt yet) expecting round 500 horse minimum, and im gona put a tru trac in the rear..
i cant work on it everyday bc got college courses n work during the week so things get done in spurts. just looken for some input. thinkn bout builden it for 150mph range