[dlampe]

You can't simply say 500 is to much. With a target wheel rate of somewhere between 275 and 300 for performance driving, 300 might be right if the shocks are perpendicular to the axle. If they are at an angle, it will take more spring.

Measure as John suggest and if the shocks are stright up and down, go with 300lbs. If they are at an angle, give us some idea what the angle is and we can sort it out for you.