I kinda think that it would have needed a full Soviet National Team to beat the mid/late-70s Habs - at least on their home-ice & best of 7. CSKA always had to add a couple/few star players to their roster (also in the 1985-86 Super series; Shepelev & Tyumenev?) when they toured the NHL.
Habs' domination in the classic New Year's Eve game from 1975 is not the greatest example; I namely do think that the 1986 CSKA was stronger than the 1975 version - not that they had better players but were far better coached and had far more dimensions to their game (definite improvements in defensive play, physical game etc.). However, IMO neither is the CSKA-Habs game in 1985, as embarrissingly one-sided as it was; there is no comparison between the 1985-86 and mid/late-70s Canadiens...