X2 I just tried it tonight, pulled the radiator, stock shroud is a no go.
The inlet and outlet necks must be closer together, or the radiator is shorter, because the stock shroud will not even sit between the necks.
I second that notion. Stock will NOT work properly with a champion. I myself am getting rid of my champion and going with Cold case. A vendor on this forum. my 318 still over heats in short stop and go traffic in about 2 minutes. sucks!