I did just this with the 455 in my 79 T/A. Think about it. By having an "escape" at the rear of the drivers side head, it allows the #5 and #7 cylinders to run cooler (or at least more evenly with cylinders #6 and #8). This prevents hot spotting in the head around #5 and #7, which helps decrease the chances of detonation in those two cylinders.
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