The AOD can be made to handle high horsepower. The main weakness is the input shaft. Art Carr and others make a single piece shaft that works with a non-lockup converter. My brother had one of these in a supercharged 351 mustang that produced 500 horsepower.
Ratios for most Ford trannys can be found at:
http://www.mercurycapri.com/technica...neral/tgr.html
Be conservative in selecting a torque converter stall speed unless you intend to do a lot of drag racing.