When the injectors are just sitting there, are they all inwards the same for start up. Have not done one for years but, need to have snap on the little U that the fuel rack arm goes into.
Put your vice grips really solidly on the clevis where the governor linkage hooks up to the fuel rack with a pin. That is your protection device to be able to pull the fuel rack out of fuel when adjusting the buffer screw and testing for performance. By passing the governor with the fuel rack disconnected from the governor can be done, but those vicegrips best not fall off or it is all over. Have done this test before to prove if the engine runs okay without a governor hooked up. If it won't run okay without the governor hooked up, you can rest assured it won't run correctly with it connected. Don't be doing this test unless you are fully prepared and not been drinking.
Simon C