There's alot of work to convert to RWD, tunnel fabrication, rear suspension mounts and links for the axle, the geometry must be spot on. There's the front suspension to sort, what type to go for? Propshafts to fabricate and balance, gearbox mounts and also engine mounts and bulkhead
mods as the engine will be going from transverse to longitudinal.
A nice project but also a money pit and you'd need to be pretty clued up on welding and fabrication as well as engineering skills.