Scott,

I'm a advocate of overkill as far as servos go. On my YA F-16, I have a pair of Hitec 5945's (180 oz torque) on the stabs, and ailerons have a pair of 5925's at 130 oz torque.
I will do the same on my BVM Falcon.
To answer your question, I think a minimum of 70 oz of torque would be ok on the F-16 ailerons. More than that is gravy.

Good luck,
Jeff