If you have a good, strong, blue/white spark that will jump a 1/4" gap, stop messing with the distributor. Clean the new 437's and burn off any invisible residue that may be present.
While the plugs are out, roll the engine over several revolutions to purge the combustion chambers of excess gas, ether, etc. Double check your firing order.
Ensure a fully charged battery, then try to start using your normal procedure before the problem.
I have used a propane torch to cure a severely flooded engine in the past, but it's dangerous!