spring size?

if your going to drive it on the street i'd suggest 165, i have 175# springs on my car and it is a good balance of decent weight transfer and stiff enough that my front end is stable driving on the highway
 
o.k im moving again with the car,and am ready to buy the springs.need a better answer. What spring rate should I go with. its an 1989 notch 12pt mild cage,thru floor subs ,tube k member fiberglas hood ect...hope this information can help...