383 vs 360 in an A 68 Cuda

I'm a huge fan of BB's - regardless of what car they're in. An engine is an air pump and bigger can flow more air. Period.
But then there us the reality of "what is it you are trying to accomplish?" As @pittsburghracer and others have shown, you can go mighty fast with a SB.
When I built my 408 in the avatar car, I can tell you the 4" stroke in that thing puts a smile on your face every time you lean on it. It's more stroke than my 440 and it is noticeable. That stroke or more in a BB...well, that would make me smile too!
But I'm sure happy with the 408 and wouldn't think twice about changing it for a BB. It all comes back to the same question: "what is it you want to accomplish?"