oh, right. forgot there was that many years difference between them.
in '87 I raced my '87 LX 5.0 (a fairly rare car in '87, only about 5,000 made, most 5.0s were GTs) against a GN in a top speed run down Rte 9 here in CT, and for miles it was a dead even race, neither one of us could get away from each other. We just sat there side by side in our lanes going our top speeds - which I don't know what mine was since I only had an 85 mph speedo (my next LX 5.0, a 1988 coupe, had a 140 mph calibrated speedo).
so in the real world, it wasn't much of a ruling far as I could tell. The 'stang was hard to beat in LX trim being almost 200 lbs lighter than the GT.
the GNX was the real killer Buick right? when did that come out?