I would recommend the 26" radiator,I have the cold case mop750 in my dart and love the thing. I have a pretty stout 410 making a little over 500 hp and a 7 blade flex fan with no shroud and it's never been over 195. I did have to drill holes in my core support but it fit without having to beat up the lower radiator support so I was fine with it.I also left the opening up front stock and just centered the radiator.
