What kind of carabiner would I use if it were hooked to a porter wrap?

If you are talking about a carabiner that goes from a sling to the portawrap I would recomend any of the steel carabiners. 

If you are talking about the carabiner that connects the rope jack to the portawrap I would recommend any of the aluminum carabiners that have a rating over 5,000lbs or 22.5kN.