Can you set the tires out wider? (hint: take a photo of the tire sideways and we'll let you know ). That would also give you a little more stability (if you need that).
One other thing is that often the wheels are dished so that the tires can be mounted with a wider track or a narrower. You will gain some clearance with the lift arms and tires if they are mounted so that they are wider. THis may be what the previous owner was trying to do, but he forgot to switch sides so that the direction was also correct. Take a look at it and see if I am not right.
Then when you reverse the pins you will have plenty of clearance.
Many of tractor owners in my area who do a lot of log skidding in the woods will reverse their front R-1's to assist them in backing out of the NE goo. R-1's are real good at "gooing" forward, but not so good at backing out of the goo. You do not have to ask me why I know this . I have pointd my lower link pins inward in the past with my old Ford. Reversing the pins did not appear to affect the attachment performance. In some cases it made attaching the implements easier. Jay
Based on all the suggestions I reversed the tires making sure they rotate the proper way and widened the tractors stance. By widening the stance not only is the tractor much more stable now, but I didn't even have to reverse the pins on the mower.