The only suggested change I could see is to 3b
Forget the fuel heater. If you still have the original fuel line heater, just leave it disconnected.
If you have the 7.3 style head, still forget the heater, but get an 1/2 tap, tap the hole and plug the heater hole. The heaters really don't do anything anyway, except on the 7.3 head, cause a leak.
Somewhere in the 6.0 run IH/Ford changed the HFCM and removed the heater from it. Mine has been unplugged for YEARS.....with no issues. The replacement HFCM doesn't have a heater at all.