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I was told some time back that the advantage to the 351 windsor firing order was not needing a cross over exhaust.
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You were lied to /ubbthreads/images/graemlins/shocked.gif To eliminate the crossover, you'd need to alternate firing between the left & right side of the block. Cylinders 1-4 are on one side of the engine, while 5-8 are on the other side.
289 order: 1-5-4-2-6-3-7-8
4 & 2 are on the same side, as are 7 & 8.
351 order: 1-3-7-2-6-5-4-8
1 & 3 are on the same side, as are 6 & 5.