Was able to get a little more work done on the engine this weekend. Here's what I did:
- Installed fuel rails and new fuel injectors & hoses.
- Installed remaining wiring harnesses from @JeffBowlsby
- Added fuel pressure gauge.
- Installed thermostat pulley.

One hose from the AA vacuum hose kit was too short, but fortunately I had extra hose from a previous project.
Still waiting on thermostat and oil pressure relief valve, but they should arrive any moment. Once those are installed, then I need to get the engine compartment ready and I should be able to reinstall the engine.