Never released?
I know every reference book says otherwise but I think it all derives from a single, incorrect source. Make no mistake, it came close enough to a release in 1973 that ad material was designed including a theatrical pressbook (I actually own one) and it was rated by the MPAA, but I can't find evidence of a single screening of this film. I suspect its release was pulled at the 11th hour. Plus, there seems to be evidence of a planned 1976 release from a different distributor. If so, this was also cancelled!
Perhaps something was seriously wrong with the film? Something that rendered it unshowable.