Trans questions

I'm sticking a 454 bbc in my 51 Dodge, 3.42 gears in the rear. I was putting a PG in it, mainly because I have a nice fresh 1 with deep pan, coan stuff in it and a hurst quarter stick. Didn't want to have to buy something else, but I'd kinda like to save it for a coupe build. A friend has a 200r4 , 86 model, what would have to be done to this to make it hold up to 450 or so hp? I've heard billet forward drum and several other opinions, but for those that are running them, what did you do other than a good rebuild?