Air shocks are never a good idea, nor are coil-overs a.k.a. "load levelers". The shock mounts were never designed to carry weight, since normal oil or gas shocks don't carry weight. You'll pound the upper shock mounts out of the car sooner or later. I learned this the hard way when I discovered the "mystery rattle" in my otherwise-tight rear suspension.
If you want some rake, you can raise the rear a little with $20 bolt-on helper leaves or more with new springs (cheap around here, about $140/pr. for 5-leaf). Ideally, though, to not look "goofy" you should split the difference between lowering the front and raising the rear. Lowering the front is a matter of turning two bolts, and you'll probably need an alignment. It's less-expensive and easier than air shocks, and you won't need to learn the tricky intricacies of welding large-by-huge washers to a torn rear shock crossmember to fix what's left of it. It's really not fun.
