The turbo from the TurboCoupe is fairly small and will only support about 300hp. If you put one on each bank, it would kick butt. There is an issue with space under the hood of an MN12 and under it for the exhaust, but with a bit of work, I think it could be done.
I do think it would make more sense to use a turbo capable of about 700cfm, that way, it isn't too big and won't have a bunch of lag and fit under the hood.
'97 4.6...Gen II reflashed EEC, 99+ control module, J-Mod, 3:73 FRPP rear, Magnecore wires, High-flow cats, 3" into 2 2.5" Flowmasters, Nokian winter tires/BFG DRs for the summer. Oh yeah...EVO. Finally went to the strip, 14.029/99.89