It might be usable if it had been frozen the whole time, but out of a bulk loader, not likely. Expect general hue anemia and bad highlight crossover, and that's an optimistic scenario. It was basically a lowered contrast tungsten-balanced Ektachrome, nothing really exotic, but with a specific intended applications, that of slide duplicating. The cc correction numbers were routine, matched to any specific batch itself; nothing odd in that respect. Pretty much worthless for black and white usage - it creates a positive color image.
But if you just want to have some fun fooling around with it, you might start with the given filters and ASA neighborhood of the rating (which will likely have changed, losing sensitivity over time), maybe bracketing exposures in the ASA 8 to 25 range, and then have the roll E-6 push processed for a little higher contrast. It might be appropriate for ghoulish Halloween shots.
But it is continuous spectrum. Otherwise, it would be worthless as a slide duplicating film in the first place. Like I said, it's just a tweaked Ektachrome. The sheet film product was somewhat different, being tungsten balanced and optimized for longer exposure times.