Drag racers use the 9" for good reason; they're tough to break. As far as ratio, they're also the best way to go because you can get used center sections, a.k.a. pumpkins, with just about any gear ratio you want. And you don't have to hire a rear end specialist to swap 'em.
You may have some here who will razz ya for putting a GM motor in a Ford. I prefer to have same engine in like vehicles (Ford in Ford, Chevy in Chevy, etc.). But a small block Chebby will fit in anything. I know I caught a bit of flak for using a GM alt and ign. module on my 223.