However, the DVD release of this short includes a 5.1 track, so I’m planning to mux that into the final! I’ll also include the print’s original track for completeness’ sake.
Whatever you do, make sure both video and audio are running at the same frame rate, or one will drift out of synchronization with the other over time.
If you plan to release your scan running at the original 24fps, then convert the DVD audio— which runs at 23.976fps— to run at exactly 24fps. You can convert the runtime easily by using eac3to. Assuming the short was properly scanned at 24fps, you should have no issues marrying the video and corrected DVD audio together. If the opposite is true— video running at 23.976fps out the gate— then just rip the DVD audio and sync it to the film scan. Again, shouldn’t be a problem.
In the event that you need help correcting either the video or the DVD audio using the aforementioned software, lemme know. I’d be more than happy to help.