LOL! Good old Ethyl. Tetra-Ethyl Lead, if I remember right...
Had a buddy that had a '71 Firebird with the Super Duty 455. Same problem with the needles on the dashboard... I've never gone faster in a straight line, though...
I'm guessing you can remember going into the gas station and asking the
ATTENDANT for "Two Dollar's worth, please!"
Dad's '57 Chevy would give some of the younger ones fits in trying to figure out where to fill it up!!!