doug hepburn, reg park?
To be fair, Hepburn, Anderson, etc... were all over #300, and many, Park included used a wide, wide grip. Park was 250ish, I believe for his lift.
Most gifted naturals that train really hard for multiple years tend to stall out at around 175% of body weight. Better juiced lifters tend to get close to 2x BW, even now, that isn't a common sight, unless you look at the advanced lifters in powerlifting. Only a very few are getting into the 2.5-3x bw range.
The raw world record in #181 class is #556 by Rick Weil at an APF meet in '86.