they dont bolt up at all?
different starter locations?
fwd engine mount locations are different so it wouldnt bolt into an s chassis?
intake manifold would be aimed towards the firewall?
pretty sure the input shafts are different between fwd and rwd trannies.
and, why would you even bother?

you know.
they make rwd sr20de's that can be purchased for little over the cost of a fwd longblock.