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According to O'Reilly's, the 1974 C30 had 2 different 454's. One was actually 7436cc and the other was 7441cc. And they recommend different carburetors depending on which one you've got. Anybody heard of this? Or how I know which one I have? Part #4-540 vs Part #4-504.
It's actually relevant because they give a different carburetor depending on which 454 you choose. Part #4-540 vs 4-504.
A lot of good info here, thanks fellas. If I can't find a reputable shop to rebuild the one I've got, I'll probably go with Edelbrock.