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My 1939 Six has a Chandler Groves carburetor and I am somewhere between looking to rebuild (or have it rebuilt -- some issues finding a kit) and considering getting the Carter WA-1 359 Carburetor that appear to be the standard model. I thought I read that this was a change do to issues with the CG but apart from that debate, the real question I have is perhaps most reflective of my ignorance-- I see numerous Carter WA-1 carburetors but different numbers related to I assume the primary make it went to or maybe a year of production. Are other WA-1 carburetors compatible and how do I know which are or are not? Thanks in advance from a novice.