The woods 90 inch is a fine mower, has swinging finish blades as I remember??, but may be too heavy for that tractor? Even though a linkage may lift an implement, the front end may be unstable even w/ a FELCheck out the Woods 990. Great RFM, rear discharge.
(Some folks remove FEL for mowing, I do not but lose the attachment).
The unit is also a bit pricey, I looked @ them when purchasing my Befco C-70. The Befco was $6500 back in 2012.
As an aside, why would mfg. rate the weight capacity greater than A safe front end balance?. All implements are not created =. Your box blade is heavy, but the front to rear distance is rather short. The Befco, & likely the woods, have a huge overhang. That cantilever makes a significant leverage difference. BTW. Your tractor would be ideal for the Woods 90 ".
As always, this post is opinion/experience & may not be applicable to any other viewer. YMMV YMMV YMMV