1975-76, 1976-77, and 1977-78 are now updated and on the site.
I haven't dug too much yet into where the interesting parts are, although I did immediately looked for this:
http://www.hockeygoalies.org/bio/nhl/montreal.html
Average opponent (SoS), 1975-76:
Dryden +0.10, Larocque -0.46
Average opponent (SoS), 1976-77:
Dryden +0.00, Larocque -0.21
Average opponent (SoS), 1977-78:
Dryden +0.09, Larocque -0.37
Average opponent (SoS), 1978-78:
Dryden +0.03, Larocque -0.18
(For those new to the thread, units are goals/game above or below league average).
These are the most significantly consistent differences between a team's goaltenders I've yet seen.