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Good Chevy big blocks: 389, 427, 454 (Chevy guys, got any others you can suggest?
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Come on now, the 502!
The 454 is a beasty beast. My friend just dropped one in his Nova, runs great. But if you're going for a Cobra i'd go with something smaller, i.e. 427 should be plenty.
As for Big Block/Small Block, generally, the rule is anything over 400 cubic inches is a big block. The names say it all, small block is smaller, big block is bigger. :P