As Bonzo say's Audi/VW is probably the easiest route as the length from crank pulley to front driveshaft is relatively short. I have seen a MK 3 Escort converted to 4x4 rear engine V8,it was done by making a 1:1 transfer gear on the g/box output feeding two shortened Atlas axle's,the front with two short driveshafts.
Handled like a kart and went like kaky through a goose !
Why is still a good question as its a lot of hard work ?
