The 52 radiator will not have the pressure rating the 327 might need to run. I'd be more comfortable with an aftermarket item made to fit the core support but with a 15+ PSI pressure capability. Be sure the heater core also gets replaced with a higher pressure item.
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!
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