Replacing cylinder head DT25C

[To better]

I have a 1992 DT25C that I am replacing the cylinder cover on due to broken bolts on thermostat cover. I have all the head bolts loose however there is not enough clearance on the bottom left bolt....it cannot back out all the way without hitting the bottom cowling. Is there trick I'm missing here or a way to get around this without dropping the cowling?

[boats.net]

Might be able to loosen cowling and get enough room.