How do you rebuild the top end of a 318 5.2L engine in an 87 Chrysler 5th Avenue?

To rebuild the top end of a 318 5.2L engine in an '87 Chrysler 5th Avenue, start by removing the intake manifold and cylinder heads. Inspect and clean all components, replacing any worn gaskets, seals, and valve lifters if necessary. Reassemble with new head gaskets, torque the heads to specification, and reinstall the intake manifold. Finally, ensure all connections are secure and perform a thorough check before starting the engine.