Gene I do not if they do good work or not but I know they have sold many GTs in Qubec and Canada.
Fairview Ford Lincoln
575 Boule St-Jean
Pointe-Claire Quebec
514 697-2211
514 875-1994
The best dealer mechanic in Ontario is Mike Hacking at Polito Ford in Lindsay. He is on the forum , monitors what happens here and has spoken to gurus like shadowman etc. I have no idea how much farther they are from your choices in Montreal.
Hope this helps.