Is it fair to say that the vast majority of the mods required in your swap from the LS3 to the LS9 were necessitated by the supercharger and its related components? It seems to me, a Pantera owner could install a dry sump LS7 for about half the cost of a Ford based equivalent. By "equivalent" I mean HP, TQ, weight, dry sump and EFI. In 2006, Hot Rod Magazine did an LS7 dyno test and found they could increase the engine's HP to 600 @ 6,800 RPM with only a cam and exhaust change.
In addition, if you wanted to mount the engine lower in the chassis, you guys now have that all figured out too. It seems pretty "bolt-in" without the complication of the supercharger.