Sean, Cal's have generous headroom. My buddy is 6'2 owns a Cal31 and stands erect in his boat and moves about without issue. He loves my Cal35C. Not sure but I think a 6'8 guy could stand and still move around without ducking.
yea, the cal's have headroom.... 6'3" throughout on our 34-III
except when passing thru the bulkhead to the head and Vberth.... its only about 5'11" and im 6'.... so it has on occasion, been a problem at that spot.