I'd just use some small -- as in 175cc -- Trick Flow SBC replacement heads.
Or Dart 180's
You need something pretty small for a mild motor with not that many cubic inches.
Just FYI -- My 406 uses Dart 180's.... it made 525 hp @ 5600 rpms and 550 ft lbs of torque @ 4600 rpm's with the Dart Pro1 180 heads.
Too large of a head will make a lazy lousy motor. So don't get caught up in the bigger is better disease.
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