Built an olds 403 that should be about 550hp. I see ebay has Champion Radiators that are very reasonable and have good reviews. However, I have heard their statements on how much horsepower their radiators cool is not accurate. Logically i would think a 3 row radiator would cool better but ive heard otherwise and that some people prefer the two row.??? Champion sells a 450, 550, and 850hp radiator for my car. I dont know which one to get that will benefit me the best. I dont need something overkill but definitely don't want to overheat of course. opinions?