How do you install an older hemi in a 1979 D-150 Dodge truck?

To install an older Hemi in a 1979 D-150 Dodge truck, you'll first need to ensure the engine mounts are compatible or modify them to fit the Hemi. Next, adapt the transmission to work with the new engine, which may require a different bellhousing or an adapter plate. Additionally, you'll need to address the wiring harness, fuel system, and exhaust to accommodate the Hemi's requirements. Finally, ensure that you comply with local emissions regulations before completing the installation.