Torsion bar trouble

Vice grips is a bad plan. It can score the metal and that messes with the integrity of the bar. You'll need either the tool or a way to recreate the tool.
This one is $35 MOPAR AMERICAN MUSCLE 23461 Torsion Bar Remover/Installer A, B, E & C Body
And there's this one for $40 1960-1976 All Makes All Models Parts | MF1744 | 1955-74 Mopar Torsion Bar Tool | Classic Industries

Both you could make pretty easily with the right scrap steel.