1967 fish with a 360 motor mount question

67Dart273 said

Round up CrackedBack. He, some time back, posted nice clear photos of the difference, and how to mod the 273/328 mounts to fit the 360.

Only CHRYSLER would be silly and do such a thing

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Same with the 360 vs 273/318/340 oil pans......why was that done? Why did they make so many different braking systems? Why the 4" bolt pattern on an A-body when they already had a 4 1/2" bolt pattern that worked just fine? So many "what were they thinking" moments over the years.