Forgot, You'll need to grind the exhaust manifold ports a bit with a die grinder and grind the casting stubs (??) a bit to clear the valve covers. Pretty easy, and all you need is a $20 horror freight die grinder and a carbide burr.
They call them "corvette style" or "rams horn" manifolds. http://www.speedwaymotors.com/Dorman-25-Inch-Corvette-Style-Exhaust-Manifolds-Pair,58966.html $114 for two. There's some nasty ones on ebay for $60+$25. Dang it, someone else besides me must like them, too.
I have a few sets already I've collected, you may just want to use the later vortec head stock manifolds that need no mods. (For me the "mods" are a fifteen minute job, but I don't know what that would be for you.)
They do flow great, though.
383 flow test
