The bolts can be a bitch. Don't bother trying to save them, just replace with grade 8 like alaskabII suggests, but I would buy from a bolt shop, should be a lot cheaper than napa. Like bloodbane suggests, driving through after cutting the head off is prob the easiest. Though I have also [gwaiis suggestion] cut the head off and after sticking washers and antisieze behind the nut, PULL through the bolt. I had a spring shop remove the bushings, but would definitely do it myself next time.... C$120.00 labor. Suggestions for removal include press, ready-rod and appropriate sockets to pull the bushing through, torch, drill out the rubber, all feasible depending on what you own. The bushing itself is made with an outer metal shell ~ 1/16", 'rubber', and an inner metal shell also `1/16" thick. That's why you're thinking it has a spring as the rubber is bonded to both metal sleeves. If you're getting new springs then I wouldn't bother worrying about the bushings as your new springs will have them, but used won't. As far as how your b-II is sitting, it can be decieving because the rear wheel well lip is actually a couple inches lower than the front, just measure from the lip to the body line. True level in my eyes is having the frame level, not how it looks to the eye.
Anyway, enough reading my babble, get to work,
Richard