Maybe someone will give you a measurement of the width of the radiator bracket. Then you can at least have an idea what width you need. My Motors Manual doesn’t give the measurements for the bracket. It does show the 327 in a bus takes 18 1/2 quarts to fill. I measured my 1/2 ton and it is 21 1/2 inches wide, I’m sure yours would be much wider. Good luck on your quest.

Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
“I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)