I have the exact same setup and I have not put the loader on with the snow blower mounte. Yes if you take the blower off you can mount the FEL but it is tight and depening on the attachment on the loder and how you angle the attachment you can hit the front of the sub frame. One poster said it would be easier to drop the sub frame. I agree that would be the best for a few reasions. 1) you will have better ground clearnce to us the loader. However you will loose some ground clearance because of the front mount for the blower but not as bad as if you just pull off the blower and leave the frame 2) Less potental to damage the sub frame. 3) Lot easire to drop the full sub frame then drop just the blower unit.
I looked at a FEL show blower attachement so I still could keep my FEL mounted all winter long. In the end I went with the subframe mouthed blower because I think it is better built unit for the task and I have read about to many stories of peole bending loader arems. Hope this helps.