Bottoming Out!! Need S/s Springs????

Ok...finally got the demon back and have been workin on'r... runnin great, but everytime someone rides in the back i bottom out over bumps..by that i mean..the tires rub the outter rear fenderwells...i think it's bc of the stock slant 6 springs.. ok well... I've heard about how if you get 2 of the same # s/s springs yoou shouldn't have an akward stance..can anyone confirm this or give me any better info???..what else would i need to give this babe like a 1.5"-2" lift...hopefully just the springs???...just got brand new kyb shocks....will these work with newer s/s springs???i hope so.. :-(.. Anyone got any complete list/prices of all this stuff...so far i got summit for around $260 including shipping...What's with this ESPO guyz..i junted but couldn't find any spring info...on there site that is..thanks to all...