64 Barracuda pace car?

A Commando 273 could hit 140 mph with 3.23 gears in a 64 or 65 Barracuda. You were allowed to hop up the motor to make speed. I don't think 45 mph was required speed in the 60's.
If they could hit 140 with a 273 that’s impressive.
I would’ve thought on a high-bank oval the pace speed would be over 100.