Any way to test the old rectangle style fuel pumps? (Briggs & Stratton 42E707 2631E1)

You asked:
Is the plate supposed to make contact with that rod, and if so, how do I adjust it properly?

YES


Re-search on-line static governor adjustment.
You can find such online for your Briggs Twin L-head engine.
Normally those do not just come disconnected on their own.
You better get the engine under governor control or it will most likely overspeed and throw as rod. (assuming the springs are connected properly behind the throttle plate)

You can also get a Service manual for that engine on=line for around $25 that answer the majority of your questions and also has picture and diagrams illustrations.

Also in your picture in post #1 if you get the governor fixed BEFORE the engine throws a rod before putting the engine to work or running it very long you need to remove the top air cowling and the air deflectors over both heads and clean the engine before it pops out a valve seat due to overheating. Engine looks very nasty in your picture and appears to be getting eat up with neglect.
 
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The throttle control doesn't do anything. When I move the throttle up and down, the triangle plate in the picture moves, but never touches the rod sticking out, which I'm assuming is the end of the governor. Is the plate supposed to make contact with that rod, and if so, how do I adjust it properly?
Is this a new to you rig? You have never seen it run before???

Reason I ask is the governor is completely disconnected like someone has been monkeying with it and you said the deck spindle housing fell through the deck due to rust and age when you were inspecting, etc.??
 
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