It will be close. Shimano's website says it holds 570yds of 50lb line.
Here is a link that compares some mono line diameters. It seems Momoi Hi Catch is about the average diameter. So you should be in the neighborhood of 550-600yds per spool.
http://www.bhptackle.com/doors/webpa...e_ID=38&DID=18
1120yds is 560yds per reel, obviously. I think if you put 560yds on each spool you should be good to go with an appropriate amount of room left on the spool so it is not too full.
Or you could use something for backing which would give you some extra yardage then put the Momoi on top of that.
Good luck,
Kg