shackles/spacer question

[tac0meat]

i have a 91 explorer 2x4 with over 300k miles. my springs are original. i am about to get a used set of 33x12.50. first off i know to fit them i will need a lift. as far as a lift goes heres what ive come up with:
1. spring retensioning-never heard of it before but my dad said that it will regain stock ride height and reverse the ten years of sag(plus he'll pay for it)

2. coil spacers-where can i get them and how much? how hard are these things to put on? could i do it myself? i somewhat know my way around a shop. and these ought to give me about 2inches right?

3. warrior shackles-again, where to buy and how much? also how hard to install?

now i want to do the suspension lift no matter what, but do ya'll think with all that i will be able to fit 33x12.50's? w/o rubbing? keep in mind that i dont do any rockcrawling or serious offroading but i like to take speedpumps and ruffroads really fast so i dont want to totally rip somethin up

 

[Clint]

two inches isn't gonna cut it sorry but if u got a 3 inch body lift u could definitly fit 33 12.50's . if u do the math if 31's will fit stock and 33's only go another inch up in the fender then two inches would do it but that would have to be 33/10.50's .

one more thing if ur coils are sagging then i would just get a set of brand new 2 inch lift coils from skyjacker