Doesn't say anything about the clutch assembly, just the shifter... it's what's not written that make the difference. They fit, but, you have to make modifications to get the stock stuff to work.
If you call them they'll tell you to just "S" bend the downleg. In some cases, easier said than down with 3/16 plate welded to a tube that you don't want to distort or tear.
Unless they've redesigned them, or, you get lucky like Steve did with his one set up, you'll be busy with the clutch linkage.
BTW, Hooker Competition headers, and any other brand that hang below the steering gear on street cars SUCK!!! Unfortunately there isn't a header designed for a-bodies that does everything well. Each choice has serious compromises.