Yeah, basically the blocks are the same and you can convert FWD to RWD and vice-versa but if you go with a FWD engine you'll end up having to source a bunch of parts with which to fit it unless you want to fabricate the mount brackets etc yourself. The FWD DE's have a poorer intake design the RWD ones and of course the exhaust manifold points vertically downward so you'd need to find a replacement. Probably not worth the hassle unless you can get all the other bits easy.

-Ed