I don't know if a JP dub exists (or existed at one point but got lost/destroyed), but U.S import films are kept in their original language on Japanese video releases while being (HARD) subtitled. I did a search on many auction websites and the like and nothing comes up for a JP release othert than imports of the U.K releases, but it could be very hard to find like the JP laserdisc of Song of The South. I only brought that up if you needed a (possibly) better source for the U.S credits and audio.

Shame that no one smart enough to start a team preservation on here grabbed that 16mm print from a while back.