Guys,
More than likely these were BB 402 cars, and yes the "Air Ride" system that was standard on all Z20 Monte Carlo SS cars was an RPO for other cars as well. I have seen a few non SS's with this system. In all this time, there have been more than a handfull of Monte 402's with a 4 speed show up. Never a SS. Statistics alone would dictate that at least one would have shown up.
Now, if you had the "LS5" out of that car and the vins on the "454" and the 4 speed matched.............
Like I said, there are many "ghost" stories of that kind. Also, the same thing goes for a Monte SS with the LS6, plent o stories and "friends" but no one has yet to have one spring up.
Is it possible? Sure, seemed like anything was back in the day
, I know I sure wish I was around and knew then what I do now!