I'm still in the process of figuring out what ultimately I want to do to my 68 Barracuda. My latest wild idea is can am independent rear suspension from a Charger or Challenger fit under the Cuda. Is there a good IRS that will fit and be able to bolt up to a 6.1l Hemi and take some abuse? At a quick glance it looks like the rear track of the Cuda is 55.6" and the Charger is 63.1. I know it's close but is there anything closer?