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My 1970 FSM shows the 383 as 3.375
So does mine, and my later FSM's show the 400 at 3.375" also.
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In the end it doesn't really matter. One would be foolish to replace one crank with the other and not balance it. The factory balance was not that close to begin with
So anybody that assembles a motor with a stock replacement crank is "foolish"? Okay. 
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and the 383 and 400 DO have a different bobweight, believe it or not.
Once again, actual numbers would make your argument more creditable.....should be no sweat for an experienced shop owner and builder.
The INTERNET, the MISinformation superhighway
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