Old thread but why not.....Most of us run 96+ Vortec heads....Those headers will not work in most street applications as they are intended for circle track. The driver's side header goes OVER the bellhousing at a 45 degree angle and meets the passenger side also at a 45 degree angle through the area where a passenger seat would be. They are staged primaries that go into 3" collectors. We typically Y them together into a single 3.5" outlet in front of the RR tire.