Camshafts, idle quality, driveability and LSA-REAL WORLD EXP and OPINION

I remember some years ago, there was a mid 70's Camaro in a neighboring town that had a rough idle cam with connecting gears. You could hear him whining 2 blocks before you saw him. It had ladder bars and wide tires in the back. Rumors were it was a 11 second car, 12 second car, and whatever. However, he never would race anyone, just lumped around town whine whine whine like a full blown funny car.
He sold it and the guy that bought it came to my house. He took it to the drag way and it ran 15.20's (best run).... LOL.
You see?? One guy had it built to what he wanted... a mean look'n and sound'n car that he never intended to race.
The other guy was majorly disappointed. LOL .... :D