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I bought a boat and trying to figure out what year my 429 big block would be. All casting numbers I find all only say Dove-C and the intake manifold says
4 DOVE- 9425- b
F4 0A21
 

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If I have my trivia correct, D id 70"s, the O is actually a 0, making it 1970 and the intake is a Thunderjet intake. No idea what the F4 0A21 is.
 

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Following on from what catskinner has said I'm thinking the F4 0A21 may be a date code.

If so it would be a January 21st 1970 build. The F4 could be the shift. That would only be for the manifold though but it gives an idea if correct.

Do the rocker covers have any stickers on them from the factory still.
 
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