I have a '90 YJ with a spring over and 2.5" RE springs. The jeep used to have a 4cyl in it, but I replaced it with a 5.0HO/np435/np205 and now the front is about 3 inches lower. The front springs are almost negative arching under the weight. I am looking for suggestions of what way to go about correcting this. I liked the weight I was at before, just right to run 35's.

Maybe just adding another main leaf with the eyes cut off will help. If that doesn't work, maybe getting custom ones from national or deaver will be the best bet. They can take the weight of your vehicle and make the correct spring for you.

"Rancho" Grand Wagoneer springs would perform well with your configuration. The 44044 spring packs will give you about 2 1/2" of lift above your SOA. I use them on my 89 with very similar weight to your set up. They will however, move your front axle forward about 1" or 2", due to the offset location of the center pin on Grand Waggy's.