Headers on a V8 (or V6) Z car are problematic. Steering linkage issues on one side, starter heat soak issues on the other side and narrow spacing of frame rails requiring small diameter primary pipes with sharp, tight bends immediately out of the port. Once down in between the frame rails you are left with a tight transmission tunnel compromising either exhaust system size (diameter), ground clearance or both.
I went with fender-well headers ( 1 7/8 " dia. primaries) that go outside of the frame rails and a side pipe exhaust system. The downside is that the battery must be relocated and the master cylinder moved to the driver's side of the firewall.
