Well all sense my last post I've done the following to my grandma

1 80maf
2 Moe tune for 87 and 89
3 dual exhaust
4 18 mustang rims

Well now that I have new rims and I replace 90% of the front end and rear the car sits way to high, so looking at coilsprings.com but not sure what a good drop for these cars and if I do drop it do I want to change "Ride/Rate being changed" and if so what should it be.
05 grand marquis ultimate edition LS Birch silver 157,295