I'm sure someone has that combo Forrest, so we should know soon.
However, since the Windsor is not that much heavier than a 302 anyway (what, 45-75 lbs max maybe?) you should still see in the neighborhood of 10.25-10.5 inches there.
If you add a big bumper and/or winch though, expect that value to be 1/4-1/2 inch less.
The reason there is a range there is that, not only are Broncos very varied, but even springs are not precisely the same from one batch to the next. So expect at least a little variable in there.
For now though, until someone pops in with their measurement, if you set it between 10 and 10.4 inches you should be pretty darn close. Split the difference at 10.25 and you shouldn't go wrong.
Paul