In the back of the Tech Service Bulletins is a series of jig-measurements for the Pantera, and more in an obscure Italian journal (Style Auto #21, published in 1971). Unfortunately, drafting rules in Italy are not the same as in the U.S, so there are refrence measurements that reference to plumb-bobs external to the body, hung off a frame jig. The dwgs are extremely light & do not scan nor copy well. Note- this is a job for someone with a frame machine, and the only one I know of with real Pantera jigs is Wilkinson in So-Cal. Get everything you expect in writing so there are no surprises. Depending on how bad it is, this will NOT be cheap, I'm afraid.