Radiators: Is 22" enough for 400 HP?

BTW, Joey, FWIW, we have a 22"x16", 3 row Champion in my son's 340 powered '65 Cuda, that is a 400 HP design, with a stock Mopar fan and shroud. It cools just fine in light local traffic and up the mountains and on the interstate in this cooler fall and early winter weather in the VA Appalachians. But we have not had it running long enough to see about hot summer weather. And hot LA traffic is another story.....

Sorry I do not have more complete info for you. The 22" wide rad is all that would fit without heavy rad support mods and was put in by the PO so we are just trying it as is. I sure wish we could get BTU info from Champion; I may give them a call someday about this.