18SF guys, anyone run a 25" motor?

[Keyscruz]

My 1978 Potter 18 has an enclosed transom, an aluminum bracket with 22" setback with a 36" wide floatation chamber. The etec 150 shaft lenght is 25" and wieghs about 430lbs. It will self bail at rest (very important when it rains). If I stand in the aft end some water comes in. Without the flotation chamber there would be 1 -2 inches of water on the floor.