Your 4760 is at 39 pto hp while my 4240 is at 35 pto hp. I use a l2195 6 foot blower, and I feel like I could handle more, but if snow depths are over a foot of wetter heavy snow, I can only travel about 1-1.5 mph. ( to keep spillover to a minimum) If you had an extra foot of clearing, I imagine your speed would have to be slower than that for deeper snow. But if you are in area that doesn’t get deep snowfalls, you would probably be fine. But if you live in area that gets a lot snow, I’d probably stick with the 6 foot blower. But just and opinion, I don’t have any experience with the 4760.
Juse for fun, I went to Kubota’s website and built various l60 machines. The l4060 is first tractor that the 80“ blower is available to build with and all higher hp machines above that. So it may be a good fit. Probably call a dealer to find out for sure though.