Most HW fighters of the past would only be LH by todays standards. However they often fought bigger men. I think he'd be competitive with alot of the greats, but to "wreck" guys like louis, johnson, marciano, dempsey, ali, a prime tyson, a prime louis, a prime holyfield, a prime foreman.... I don't think so...
That to me says that an out of shape lewis would wreck the ATGs of the HW division.