Tom Bryant in Maine will be your best lead in the Northeast for information:
https://thosbryant.wordpress.com/
Baked Beans Garage has several good videos on these engines:
https://www.youtube.com/@bakedbeansgarage116
I've put together a few videos over the years that may help with understanding the platform. Links below.
Engine Rebuild Timelapse:
https://youtu.be/FFhuF0MRlEI?feature=shared
Injection Pump Timing:
https://youtu.be/T5FbB8n3f8g?feature=shared
Thermostat:
https://youtu.be/ITIShjFHAs0?feature=shared
Engine Removal:
https://youtu.be/t1s_m0thVBQ?feature=shared
Injection Pump Solenoid:
https://youtu.be/noQcDKVvrhY?feature=shared
Fuel Leak Tracing:
https://youtu.be/2_LArpH8gbg?feature=shared
Pressure Testing:
https://youtu.be/lA2yC2xouWg?feature=shared