Mep-003a wont stay running

[SCSG-G4]

Definitely seems like the governor isn't doing anything. Once I start cranking, it goes to wot and just stays there

In the middle of the picture posted there is a black 'rod' going from left to the middle, then a couple of nuts with a lock washer between them, then out the right side is a much smaller wire/cable. The U shaped bracket that it goes through is your tie down point. Get one of the nuts on one side of the bracket and the lock washer and other nut on the other side. Then tighten it up and try starting again. Adjust that center part back and forth till it is running at 1800 RPM's.

 

[Ray70]

The governor going to W.O.T when you begin cranking is correct operation.
The governor won't start pushing back against the spring until it starts and gets up to speed.
The excessive white smoke while cranking and slow starting ( as well as your delivery valve being previously stuck ) is an indication of a possible problem with the IP's plunger guide, which throws the injection timing way off.
The other thing I notice is that in your 2nd picture the tip of the governor rod looks a little bit low.
The adjustment nut where the vertical arm meets the governor arm is typically at or just above the top surface of the solenoid, in you picture yours looks to be a little below the top of the solenoid, possibly indicating an issue with the governor or a tweaked governor arm.

 

[Guyfang]

The whole Governor system should be reset up as if you were starting from scratch. Then and only then can you start to fine tune it.