That one is my favorite rendition of that piece. It is played much faster than most other renditions which seem to drag. Play it a tad faster brings it to life. This one was broadcast on a local FM station at the time and I recorded it on my reel-to-reel. I learned the ending just to understand what is going on and used to be able to play it extremely slowly Horowitz is hitting three and four note chords with each hand in the descending climax at end.
It is my all time favorite! There is something special about watching Horowitz's hands on the keyboard while hearing the music...and watching him glance up at Mehta ever so often.
To me, that is a priceless 16 minutes worth of film.