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I realize the manifolds would be the same but on an RB block the outlets would be further apart and higher than a B block. You would think 383 pipes would have clearance issues. Easy for an exhaust shop to tweak but would the factory go to that trouble on the assembly line?
Any difference in the doors between these years? Need a pair for a 67 coronet and found some 66’s but they are too far away for a side by side comparison.