26" radiator for a slant six?

Hello guys

My '71 Demon doesn't have its original radiator anymore, but a brand new aftermarket one.
Cooling is just fine.

I have the opportunity to buy an original but used 26" rad (#34434970), seemingly for '71 318/340. Isn't it too much large for a 198ci, causing too much cooling?
Would the cooling liquid reach 180°?

Thank you in advance
François
Overkill
I dont like using used radiators, too many bad experiences
Source an American made direct fit replacement, you will be better off in the long run. Stay away from the off shore junk.