Piers has the best deal going for a delivery valve socket... . you'll need this to take the DV holder out so that you can measure plunger lift with a dial indicator.
Bear in mind that these tools are not as easily accessible as gasser tools, and you can't get 'em at NAPA.
You'll need the DV socket, dial indicator with a long nose that reads in metric, chart for plunger lift VS. degrees of timing, torque wrench capable of at least 85ft. /lbs. , 15mm socket to take off #1 valve cover (to verify TDC), patience, 3/4" socket to take off that stupid valve cover COVER, 3/4" open end wrench for injector line, 8mm socket for removing injector line holder thingies, little magnet to remove DV assembly, and a new DV holder o-ring... just in case.
This list is non-linear..... the order I listed stuff is NOT the order you'll need 'em.
I might have forgot something... . but this is a basic list of stuff you need.
Matt