I have a couple questions about my Carter W-1 carburetor. The metal tag has "839987" which I guess is Chevy's part number for the 574s. The tag also has "K7"; a tiny cut-out shaped like the clubs symbol from a deck of playing cards; and another tiny cut-out of two diamond shapes side-by-side. What does all that mean? Also, the float bowl doesn't have a "C" for Chevrolet; it has "RPD". What does that mean? Is this 574s somehow different than the 574s made by Chevy? (carbking, are you out there???) Thanks for any help with this!
Dale