In 1980 I ran a 70 Duster with a T/A 340, B-Body Hemi 4-speed, and 8-3/4 with 4.88 gears. It was black with a 6-pack hood and a blue crushed velvet bench interior! It was a street/strip car and ran a healthy 12.20 at it's peak. I was tuning it one day and had the air cleaner just sitting on the carb with the wingnut on top. I bumped the timing a bit, burped the throttle, it backfired and the air cleaner jumped off the carb, the wingnut hit the hood then went in the carb. The next thing I new I heard a bang, then the car quit and white smoke pored from the drivers sidepipe. Took it apart and the wingnut had wiped out an intake valve and the valve was sitting sideways in the piston, I still have it for a reminder what a 10 cent part can do to a nice engine.