Exhaust recommendation?

I have a 1990 K1500, stepside with a 350. I'm considering replacing the exhaust, I'm looking for a dual exhaust system, I'll likely be swapping from manifolds to headers at the same time. Any recommendations? I've heard the Gibson package has worked well for some folks, though I don't know of anyone who fit it under a stepside, and if there were any problems.

If you're getting headers anyway, just flip em over, notch the opposite side for the sparkplugs, and cut a hole in the hood.... that would sound sweet. Plus, that way you wouldn't have to worry about the stepside. :)