Auto Trans Question

[93CougarXR7]

I am planning a new project car and need some help/ advice. I will be putting a late model 5.0ish into a 73 Mustang and would like an automatic overdrive trans. My questions are....
1) Which trans is better - 4R70W or the AODE? (I would
prefer a computer controlled trans - hence no AOD.)

2) How much horsepower will these things safely handle?

3) What year and model will bolt to a 5.0. I know a 94-95
Mustang had an AODE, but what about the 4R70W?

4) Who makes the best shift kit?

Thanks for all your help. You guys are awsome!!!!