Steering linkage w/ headers
I just find it very difficult to fathom that Kooks headers would have any sort of fitment issues. My PaceSetters slide right and have a ton of room between the primary and shaft. My friend who had the LT1 rack also has a ton of room after switching out the incorrect rack.
Here's another good picture of the different racks (LT1 top; LS1 bottom):








