If you decided to mount the engine in the rear, you could always either make a VERY short drive shaft, or connect it straight to the rear dif. Either way, not all that hard. Then, you'd want to throw in the rear end from either a supra, or you could convert the rear suspension to the same as the front so you could mount the axles. custom axles aren't that hard to create. Just have to spend some cash. The only thing that I can really see being a headache is the gas tank, and blocking off the rear so you're not getting fumed out.