jedihunny was correct with the time frames. I would find it very curious that Disney would release a film with Heckle and Jeckle. Are you sure it isn't the black crows from the Dumbo movie?
I'm guessing that your item is in a cardboard box with nice artwork since you mention the crows? Probably color front with black and white art on the back?
Old films from Disney, or any other studio, have very little value to collectors. The main problem is that film stock does not age well, and usually when put into a projector, the results are small broken celluloid pieces.
Second, very few people have film projectors any more.
If the box is in good condition, with good graphics, and the reel contents are intact, you may find someone willing to part with $20, but I doubt it.