Changing governors does nothing but put the mag out of time. Unless you pulled the camshaft or crankshaft, you don;t need to worry.
Timing E4As are just as easy as F4s. You want to remove #1 spark plug, and make sure you can see the marks on the flywheel. I like to set mine so that just after top dead center the mag trips (impulse coupling trips). That way you don;t get bit. Of course, you want it set this way with the mag lever in the half way position.
How you time the coupling in that there are two 1/4" bolts opposite from each other. Take them out. Pull the distributor cap. Rotate the mag until rotor in mag is on #1. Then rotate the engine until #1 is at top dead center. Match up one bolt on the coupler and screw it in hand tight. Rotate the engine and see where it trips. If it trips early, advance to the next hole. If it trips late, roll the coupler back a hole. After a while you get good at this. Like riding a bike.