HUGE win ... but given that trade was made six years, 8 months and a couple of weeks before Dryden was called up in March 1971, and Dryden almost passed up hockey for law school, I-M-O it was a "wildly lucky" win than a good trade that panned out as expected.
I've (obviously) always like 1970 first (10th overall), Ernie Hicke and Backstrom (to keep LA ahead of Oakland/California) for Lafleur ... Kordic for Courtnall, and Mickey Redmond, Bill Collins & Guy Charron for Frank Mahovlich are also favourites.
After some research, some other 0ne-sided deals favouring the Habs were:
Doug Piper & Garry Monahan for Bart Crashley (just for his name) & Pete Mahovlich
Rivet for Gorges and SJS 2007 1st Round Pick (Max Pacioretty)
Dick Duff for Dennis Hextall & LA's 1971 2nd Rounder (Larry Robinson)