22-inch Replacement Rad. for six cyl.?

Johnny Dart said

I have the original 1965 19" 4spd radiator in my /6 Dart.
Cools the car just fine. I can't see any reason any /6 car would need anything more than a 22"radiator let alone a 19".
If you're having problems Cooling with either radiator, you have other issues.

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I had a 19" radiator in my Swinger with a 318 and dealer installed air conditioning. THe only issues I had was in 95° weather, in town driving, waiting to get parked at a car show with the a/c on, and a bad cap. As soon as I shut it off the coolant superheated because of the loss of pressure and puked all over the pavement. (embarrassing to say the least) THere are a lot of reasons why the op is having issues and a bigger radiator may not solve the problem.