1999 5.2/46re into 1974 Duster?

Been searching on here for some answers but still have questions. What I have is a 1974 Duster that was a 318 car with an auto. My daughter had a 1999 Dakota with a 5.2 with a 46re 4x4 tranny, cracked and bent frame. I found a intake manifold from Huges that will replace that ugly turtle shell they call an intake and still use the injectors. Oil pan and exhaust will come off a 1970's valiant engine. Will simplify the wiring but still use the ECM.
what is required to put the 46re into the car?

Sell the engine and trans and buy a 5.9 & 46 RH. Use an SCT Tuner with a reflash, upsize the cam and add headers. THe car will be fast. Check out the US Car Tool trans swap parts to see if the will work with the 46RH, and adjust the floor pan to accommodate that big trans.