Not sure about extra power really, maybe a flat top piston, polished ports and higher lift cam..
But do check you camshaft for wear and the head as the cam runs straight in the aluminiun with no bearings. Also check the lobes for wear. On mine the cam had scored the head and the case hardening wore on the cam lobes, also the gears were wearing at 16000 miles although cant be sure it was the correct mileage.. The other thing to check is the engine drive chain as these can stretch and may need adjusting..
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