The NV5600 may be an option. I do not know if a bellhousing from an NV4500 would bolt to the NV5600. If not then you would need a custom bellhousing as the NV5600 never came behind the Magnum V8's. If your budget is limited then NV4500 is probably the best you can do as they are expensive and the NV5600 would be very expensive. Neither one is very common so even finding one would be difficult.