I know these cars didn't get built with this much power from factory.. and there are many other variables to consider, but a repair like this wouldn't be my 1st option.. That almost looks like a slant 6 or base 318 leaf pack. From the looks of it was flexing like a banjo string.
Clamping the front segment and un clamping the rear segment are perfectly acceptable traction methods found right in the Mopar Suspension manual. It's in every single edition.