Wow, when all that happened, did you notice it immediately? We would love to see pictures of your car.
It sounds like you need to have the car put on a frame machine by someone familiar with old Mopars. If you haven't put subframe connectors, torque boxes, a full cage and a motor plate in yet, you may want to think about doing so.
With that much power & torque hooked to a manual transmission, the shock load is obviously massive.
You may want to consider using the Caltrac Mono leafs with the Caltrac set-up, as they recommend. They do tend to sit low relative to what you have in there now.