1971 Duster Handeling

So basically no bone stock mopar besides a gen 3 b body can do140 to 150?
Not really. The aero cars, aka The Daytona’s, Superbirds, Charger 500s could easily. The 3rd Gen B Bodies, The 1st Gen chargers could probably do it, maybe. The TAs, AARs probably as well. Course that’s gonna all be on a track of some sort.

that said, no way am I doing that on a street or even a highway. Too many variables that could go wrong.

You still haven’t answered the question, why do you need to do 120-150 mph sustained on the STREET?