If you're going to modify, why not go to a late-model crossflow radiator while you're at it? I had to do this when the radiator from my 59 carryall was stolen while the truck was stored in a tow-in lot. (It had broken down, and before I could recover it from the towing service, somebody helped himself to the radiator!) I used the lower mount assembly from a rubber-mounted crossflow radiator, and fabricated an upper hold-down assembly from sheet metal. It worked OK, including a cross-country trip from California to Tennessee, towing another vehicle.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!