HiCustomer Welcome back to JA, i am Buddy and i will try and help you out. To set the injectors you will need tool 9U-7227.Also you have to row then engine over with a ratchet or barring tool and pin the flywheel on right side of flywheel housing with 3/8 bolt.
Here is picture where u put it on injector.
This is procedure you set injectors.
To make an adjustment to the unit injectors on cylinders 3, 5, and 6 use the following procedure:
Here is procedure for setting valves
Adjust the valve lash while the engine is stopped. Use the following procedure in order to adjust the valves:
Note: If the engine is equipped with an engine compression brake, loosen the adjusting screw for the lash on the slave piston for the compression brake prior to adjusting the engine valve lash. Refer to the Testing and Adjusting, "Slave Piston Lash - Adjust" topic in order to adjust the slave piston lash.
Note: See Testing and Adjusting, "Finding Top Center Position for the No. 1 Piston" for further details.
Before any adjustments are made, lightly tap each rocker arm at the top of the adjustment screw. Use a soft mallet to ensure that the lifter roller seats against the camshaft's base circle.
If you need anymore help , just ask. Thanks again