How do you determine the position of the plates if I want to wire them shut?
With the shafts freely moving & the bi-metal springs removed, gravity will turn the counterweights to the normally closed position. You do not
want to wire them shut (your car will run like crap once it warms up). The wiring would be done only to keep the plates open
(i.e. holding the counterweights against
Your fuel pump may also play a part in the hard cold starts. The original-style mechanical fuel pump has a hand-primer lever which would allow you to prime the fuel system if the car had been setting long. Some aftermarket replacement pumps do not include this feature (I've had one of these before). As a result, if the car has sat for an extended period of time, for several possible reasons there may not be sufficient fuel within the carbs & supply line to start & keep the car running until the mechanical pump can deliver the required uninterrupted amount (this is a reason why you must keep cranking the car to finally get it started).
If your current pump does have the priming mechanism, pump it 10-12 times prior to starting the car. If you have the original pump, but it isn't working, it is worth getting a rebuild kit for it (the original lever-type is the better design).
If your pump has a screw-on lid, undo it & drain any water which may be present.
Coupes & later model sedans were outfitted with electric fuel pumps (which are fine as long as they keep getting electricity).
If you don't have a hand-priming pump, try this test next time you go for a drive & have a hard start (or hard restart). Take a squeeze bottle with a little bit of gasoline in it. Have your air cover off so you have access to the top of your carb(s). Squirt some gas down into your carb (this somewhat imitates the priming function). Turn the key. Does the car start right up? Does it keep running or die out? If it dies out, how many times do you have to squirt gas in the carbs before the car starts & runs normally? (This will be the approximate volume of fuel which is not
be within the fuel line between the fuel pump & carbs for startup).