Re: tom morello's strat soul power
He has a Hotrails bridge and 2 Fender Fat 50's in that LTD Edition Strat w/binding and Floyd. He normally plugs into a Marshall 2210 channel switching 100W head, which is more important to his sound than his actual pickups.
If I were you, I'd buy a H-S-S pickguard, leave the stock singles, and put a fullsize humbucker like a Custom 5, Custom, JB, PG, or 59 in the bridge pos. They sound a lot closer to a Gibson/PRS type sound than the midrangey rails type pickups.
Make sure to get a tremspaced humbucker for your strat. I have a Custom 5 trembucker and 2 Fender Fat 50's in one of my strats, and love it. I can get Stevie Ray to VH to Metallica out of that guitar!