Hum...let me try.
Ten of Cups is a traditional 'happy end' card - so if the marriage is a happy end to you, that's one card that can mean it, specially because in many decks it shows a couple.
Nine of Cups is traditionally, even in normal cartomancy, the 'wish fulfilled' card...this one needs a more specific question, though, since it can be any wish.
The Lovers could be a marriage card, even in Crowley it shows two people that look like they are marrying...but i wouldn't trust 100% in the Lovers because it's a card of choice, free will...the choice can change, things can get a different way. I'd say the person who gets 'the Lovers' in a marriage question is unsure if he/she wants to marry or not, or is just speculating.
The Hierophant is another traditional marriage card since he is, well, a priest.
The Justice doesn't mean marriage itself, but can related to the legal part...paper work, documents and the like. If you get the Temperance/Art with it, then be prepared for some long time to get things ready.
That's all i can think of now. Hope that helps!
Yuko