For the true purist, run the FLAC through a DAC with a “Minimum Phase” filter. The 1972 tape masters had slight phase shifts. A linear phase filter (common in cheap DACs) will smear the transients of the timpani drums in the “Overture to the Sun.”
Original 1972 vinyl copies are highly collectible and vary in price based on condition and pressing location: va a clockwork orange soundtrack 1972 flac cue