I realize that this is tangential to the thread topic (since John Adams *did* play for the Bruins later on).
In the New York Times' box scores for 1967-68, they typically list all starting players and the alternates (which look to include the backup goaltender, although it's never directly stated as "Goaltender"). Based on what I know about goaltenders, the backup goaltender is either listed as the first alternate or the last alternate (it varies).
In late December 1967, both Gerry Cheevers and Ed Johnston are injured for the Bruins, and Andre Gill is the starter. In their December 27th game against Chicago, their lineup is listed as:
BOSTON - Goal, Gill; defense, Smith, Orr; center, Esposito; wings, Hodge, Williams. Alternates: Green, Bucyk, Sateher, Sanderson, Stanfield, Westfall, McKenzie, Shack, Doak, Awrey, Murphy, Adams.
So the backup goaltender isn't Green (that's hopefully obvious). Which means it must have been Adams, right? Is this John Adams? Adams was the regular in Dayton of the IHL that year, and did later play for the Bruins, so that's my guess. Any more support that Adams was Gill's backup in late 1967?