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HAVE A 396 WITH BLOCK #3955272  DATE I-17-68 HEADS ARE 3904391 BOTH ARE DATE I-20-68 4 BOLT BLOCK  6223 CRANK . HOW DO YOU TELL IF 375HP OR 425HP EVERY 375HP I HAVE EVER SEEN HAD 840 HEADS MOTOR WAS IN 69 CAMARO ITS ALL FRESH WITH ROLLER CAM AND 42CC PISTONS   HAD 750 CARB ON DYNO MADE 600HP .