JG, yes that is a 391RC2 w/243 clamp. The only reason why I would keep the Manfrotto window setup is the plate, that would be nice.
I haven't used it yet(w/the clamp), it is solid, weighs 1lb 9oz total, almost as much as the little spotter....grin
In other words it would work well with a big 85mm scope.
You have first dibs.
Here's a little better pic.
Next to the old Tasco, the new one is a toad.