134.000 is confirmed as a Gander Center high altitude frequency (FL290 and above), it's often combined with the high frequencies that can be heard on the Goose Bay feed. 119.700 is listed as a Gander high altitude frequency as well but I have not heard it in use, maybe used as a spare ? There is also 132.250 at Wabush, this is a Montreal Center low altitude frequency (FL280 and below).
A feed covering these frequencies would be great !