well, I might have my terminology wrong, I was just repeating what it says in my 1936-1942 plymouth service manual on page 124 in the explosion diagram of the carb. It referrs to the needle shaped pointed thing that prevents fuel from comming in as the "float needle", the thing that it seats against (and that at the other end doubles as the fitting where you screw in your fuel line tube) as the "float needle seat". Also, on the next page when it describes disassembly, cleaning and re-assembly it repeatedly referrs to it as a needle valve.
This "needle valve" is situated horrizontally and the tab that is moved by the float pushes on the blunt end of it causing the shaft to slide through a centering tube and push it aginst the seat that matches it's shape thus shutting off the flow of fuel. the only thing that prevents fuel from coming in is the presure of the tab actuated by the float. I was thinking that if the float was bobbing around too much because the engine was shaking terribly(for whatever reason) that this shaft (needle) would bob in and out letting fuel keep squirting in and over fill the bowl.
I will report back what I find after I replace the engine mount and check the other obvious things (such as ignition and such). I have only driven this car once and I am still getting the bugs out of it (mostly things that the previous owner did wrong). I am having fun but I wish I could have driven the car more before winter (new toy, want to play with it before snow and salt).
Thanks for the help. I can see that this will be a very valuable resource.
Rebecca