St James the Apostle Church still exists in Montreal. You might try writing them for a marriage certificate seeing you have the exact marriage date. The marriage certificate will probably indicate the names of parents and if you're lucky, where the groom was from. The address is: 1439 St Catherine St W. Montreal, QuebecH3G 1S6Tel: (514) 849-7577
Another suggestion: Depending from where you're writing from: there are marriage repertoires that exist for many Montreal Churches. These most likely are found at the Montreal Library or centers where genealogical research for and around the Mtl area can be done.