It is true that most JL8 cars will be Z cars, but it was not a required option (the Z28 pkg that is). Matter of fact I've seen a couple of L78 cars that were also factory JL8 cars, and there was at least one Motion car that was as a JL8 car as well.

[Edited by greg2001LS6 (03-17-2002 at 10:10 AM).]