Not sure, because I don't know exactally what it weighs. All I can do is guess. But since I know the 100 series is ~600lbs and the 300 series is 1100lbs, my best guess is that your mower weighs 800-900lb range.
Your tractor has close to the same specs as my 29 PTO HP
L3400. Weight of ~2500lbs and rear lift @24" is 1500lbs. And I am running the 1100lb 306 cutter as I mentioned. Which is probabally a bit big for my tractor, so I would be a good one to ask if it was too big
IMO, HP and the width mean nothing. Because the width of the cutter doesnt effect how fast you can mow. HP does. Sure, you can go faster with a smaller cutter, or slower with a bigger cutter, but in the end, acres per hour is going to be the same:thumbsup:
So dont worry so much about HP and size. Rather focus on how your tractor handles the weight.
Is that cutter throwing your tractor around?
I assume you are leaving the FEL on, if not, how light in the front is it? Is it a wheelie popper going up a slight grade?
Does that 6' prevent you from getting into tight areas that you need to? Does it make you combination too bit to trailer?
These are the more important questions IMO. Get some experience with it. If it is too much to handle, you will be able to tell in short order. And then you can always sell and get smaller.