If it can spin that prop about 13k in the air, may be faster than the 7.5? But that would be a trick I think. No doubt it will move along. I'd make a SWAG of 140 - 145 on that prop, but I could be all wet.
Where is peak power made on that engine I wonder?
It should turn over 13,000 in the air i run this motor on an apc 11x8 and turned 15,000 on the ground wont know intill it is done and can put a tach on it and see what it will do.