One thing that's surprised me as to this point in the thread, the 383 votes are doubling the 360 votes. By all means justified because there really is no correct answer, kind of an each to their own. But I'd have guessed the A-body folks would have stuck to the 360. :)
The 383 is every bit as easy to install in an A body, so what's not to love? Plus, it has the distributor staring you in the face when you open the hood, instead of having to reach for it.