A904 high performance rebuild--advice wanted

Cope racing transmission just rebuilt my 904 that I am putting in a 71 dart with a fresh 360 magnum. Best guess is around 425hp. He has stock rebuilds on the shelf basically. For the pro street 2 was $1,100.00 plus another $320.00 for the tc. the 904 is good to 500 hp. The reason I went this way was because I didn't want to cut the drive shaft. As far as the atf, I was told Valvoline. You should check out copes web site. It will give you insight to cost and what you get for your money. As far as torque converters, all he uses is PTC. I don't know a hell of a lot about it, I just want a fast, dependable ride. But, that's the way I went.