There is a very limited number of replacement radiators out there that will Fit and cool a 460 F53 MH chassis. If the radiator has 1451 as part of the part # it will NOT fit your MH. All the copper brass radiators that I find, only have 15 fins per inch, ver your OEM radiator at 20 fins per inch. 15 fins per inch will not radiate enough concentrated heat to make the fan clutch operate properly.
I've been there and made the mistakes.
What I ended up doing was to remove the composite end tanks from my OEM copper radiator and replacement them with the brass end tanks from the new replacement radiator. It was kind of a custom deal but I now have no leaks and the cooling is back to normal.
There are aluminum radiator out there for your MH but I don't have any feedback as to their cooling capacity.
If you can find an old radiator guy, have him install some custom brass end tanks on you OEM radiator. The tubes in your radiator can be rodded out and cleaned.
Richard