need advice: 440 in a Duster

The chassis can use the frame connectors, and I know that from experience.Lol! The firewall presents no problem. You`ll certainly need a good differential like the 8.75 and a driveshaft can be cut from another or made up for your set up. You`ll have a torque monster but without some way of getting the power to the ground you`ll just have a tire fryer.