electric fans

I have a 400-450 horsepower 347 stroker, im thinking about getting this radiator Mishimoto MMRAD-MUS-79 - Mishimoto Performance Aluminum Radiators - Overview - SummitRacing.com will the 1800 cfm dual electric fans for that radiator be enough to cool it?

i just bought the mishimoto radiator kit from late model and i got it wired up but i wanted to hook up the manual switch on it anyone ever install this switch? how do i do it? thanks