That 95.6 mph top speed observed at the GM Proving Grounds for the new '36 Century rings a bell. I read that years ago. Thanks. However, a coupe or convertible would be no faster. Actually, a convertible would be a trace, perhaps a couple hundredths of a mph, slower due to drag from the cloth top.
Absolute or top speed= coefficient of drag (CD rating)/horsepower/final gearing
And even if Buicks defied the laws of physics, Flint would still publicize the absolute highest speed they could wring out of their new car, regardless body style.
Thanks, sir, for confirming that figure.