The OP will be fine with an orginial type replacement. I run a universal aluminum two tube crossflow aluminum on my Dart. My 408 was in the 550 hp range and never ran over 180 in hot weather. I suspect it will cool my new 434 without any issues. I did have to fab up the mounting brackets and a shroud, certainly not rocket science. Factory replacement hoses fit it too, $175 from a local roundy round shop.