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just port your 5s head and do a thinner head gasket like Phoenix said. That'll get you flowing better and up your compression. If you're looking for the advantage from the cams and such the 5s ecu won't work with the 3s head. Honestly it'd be cheaper to get cams, do some head work (port and polish), and install a thinner head gasket then to try and swap heads. Look at the NA section stickies.
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