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I don't think you should have any problems with a three core as long as it is clean. Are you using the shrouds and stock fan? If you going with an electric fan that should be ok.
The ford factory put two core rads in front of 351 motors in the mid 70's and they worked fine from what I can remember.
Last edited by Mervy49; 04-22-2013 at 01:11 AM.
Reason: more added