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Well, the only way you could get that 22" rad is with an automatic and non optional rear end. If you had a four speed or an optional rear end, either of those would upgrade the cooling to a 26" rad. Frankly, it would be dumb to try and cool your now upgraded car with the smaller rad. I believe your only real option is the 26" with clutch.

Well, yes I already knew that the 22in was standard size unless you got the 3.55/391 (a36) but the orig owner of this car must of wanted a cruzer with a 3.23 open rear and whitwall tires on a orig 440/6 car. BTW , a 22in rad with a modern HIGH EFFICENCY core and a good water pump (edelbrock/ milidon ) will cool a 528 Hemi without a problem and at some point in time ,I may want to sell this car with its orig auto/3.23 combo and orig rad . Remember, a 71 440/6pack Challenger (numb match and citron yellow ) is a VERY rare car.