Well maybe its high time i get me fab shop going!!
I have been thinking if some cheap 3rd gen long tubes would fit physically in there, and could just cut the flange off and make a new flange(fairly inexpensive) and weld it on. Or just make an adapter and bolt it all together. Not sure if it'd work out though. We did compare a hemi exhaust gasket to a 4.7 gasket and the ports appeared to pretty much line up. The bolt holes were not inline(which is good if using an adapter).
Pacesetter long tubes for a 3rd gen can be had for like $300 IIRC(maybe I'm wrong? but I swear that's what they were brand new). Maybe another $100 in fabbing flanges, and then a couple hundred in ceramic coating, not too expensive, just labor intensive.