Dana 60 S60 or Ford 9"

You need to go talk to guys who are currently racing that type of car and pick their brains on how to build the car. I doubt that you'll find any serious racer recommending a Dana 60 for that type of car. You can also call a few chassis shops to talk about building a car like that and see what they say. I'd be surprised if any of them recommended a Dana 60 for that car.