engine, transmission, tailshaft, ecu, wiring loom, ability to link ecu to bcm etc, exhaust, radiator, miriad of smaller parts,
as mentioned you rally need a donor car, or a lot of knowledge and deep pockets
Would also need a K-frame too. Smaller parts is kinda what kills it, and buying all of the above separately becomes more expensive than just buying a 5L VT to begin with.