What a funny old thread this is. First of all, The Act was issued on DRG, not Epic. Not sure how Epic would have gotten it at any point in time.
Secondly, not mentioned in this thread is that Furth completely revised this and that version was workshopped here in LA - I saw it. It was worse than the Liza version - like hugely worse. Gloria Loring played the lead and Peter Strauss her love interest. If anyone thought the original book scenes were soap opera, they didn't hold a candle to this. Add to it dreadful direction and choreography by Walter Painter - one of the most excruciating afternoons I've ever spent, and yes, I saw the original pre-B'way here in LA - that, at least, had Liza, the terrific Ron Lewis choreography, the great Roger Minami in Arthur in the Afternoon, and I believe at that point it had the Halston costumes and the title had already changed to The Act. Scorsese was still directing, but I think Gower was about to come in. It was a mess, but had its oddly appealing moments. I have the program from the workshopped revisal somewhere - can't remember if any songs were cut or not, although I know Shine It On was gone.