I'd take it to a shop asap! Sounds like your buddy really messed things up...he definately didn't put it back together correctly since your wheels are not straight. Oh ya, I wouldn't even drive it the shop...get it towed. I've done lower springs myself on my old mustang cobra, and there wasn't really much that you could screw up...looks like he took some things apart and couldn't remember how to put them back together right. I know not much help, but sounds too dangerous to bring it on the road again. Some may say bring it back to your buddy, but after what he did, I wouldn't!
Edit: Oh ya, you need to take what's in your signature and tell your buddy that!
Edit: Oh ya, you need to take what's in your signature and tell your buddy that!