I gave this some thought a while back. The w-body is not engineered for rwd, therefore the rear suspension is not very strong and as with most fwd cars there is not much of tranny tunnel. I've come up with a couple of ideas found surfing the net. These would give more room in the engine bay and better weight distribution.
1) Use a curved "rope drive" torque tube and rear transaxle from a 63 Pontiac Tempest like Jay did on his v-12 Corvair. See it at
www.corvaircorsa.com/V-12-01.html . Very cool conversion. Don't know how I would hang the transaxle and suspension though.
2) Torque tube with manual transaxle and torsion tube suspension from a 944/928 Porsche. As with the 928, the 944 transaxle can also handle the power and torque of a v8. Found info at renegadehybrids.com they do v8 Porsche conversions.
The only thing stopping me from persuing this is time and money.
