Can you raise the transmission angle up? Cut the exhaust, raise the transmission / engine angle up within tolerances, add a exhaust flex and you should be good.
Like everyone else here said its your Exhaust. Theres things that you don't see until you start messing with something else.
Your exhaust wasn't correct to begin with. Just because it worked before doesn't make it right because you had a greater margin for error with the car higher. Now your car will handle much better but the margin for error on your exhaust was exposed.
My exhaust clearance. Nothing hangs below the subframe. This was a normal 67 dynatech exhaust