I'm near the end of my 1979 F 150 short box restoration. I felt that the truck was sagging so I put on coil over shocks in the rear. Now with it back together, it's obvious that I now need to do something in the front to level it out. I haven't quite figured out yet how much but I'm guessing between 1 and 2 inches. Anyone know which heavy duty front coil will get me there?