Need opinions on radiators

I need your guys' opinions on radiators. I have a 340 being built, roughly 400HP. I don't have a radiator yet for it, but was wondering what you guys think I should go with. Stock 340 rad? Or aluminum? Or what? I read elsewhere that Challengergary is a rep for Champion Radiators, anyone suggest I go that route? I am hoping to run my clutch fan. Opinions?