Radiator core addition cost???

I have a 22” radiator out of a 71 A Body. Clutch fan, shroud and a fresh 408 built engine. 220+ today, and yes I’m worried. The radiator looked good, so we didn’t worry about it. Now, I’m not so sure. I have a Champion aluminum available, but that one didn’t cool so well when had it in the Valiant before the engine rebuild. So, I don’t know what to do now. I’ve never had cooling problems before.