Suspension Settings for new springs

I bought some new springs off of ebay and was wondering what setting I should set my bike at. I have a 1991 YZ250 with .42kg/mm springs in the front for a 167 lb rider and 5.2 kg/mm spring in the rear for a 197 lb rider. I currently weigh 200 lbs and ride motocross in the beginner class but hope to move up this year. Thanks!