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there is no difference in any of the standard 429 blocks, and only the boss 9, scj, and some cj blocks were different, but the 429 2v, and thunderjet are exactly the same block, crank, rods, pistons, and heads so as soon as you change cam, and or intake what difference does it make plus they have exactly the same casting numbers.
Now the 3 others I mentioned are easy they will have 4bolt mains, and the same casting numbers as the 2 bolt mains usually. The one that is truly different is the boss 9 block in that it has priority main oiling, other than that it's the same as the scj, cj block for all intents, and purposes