What @thager said - but, be careful when you widen the space between the bunks to be sure as the boat rides lower on the bunks that the boat's v-hull, the skegs, prop and shaft will not make contact with the cross beam. Allow about an inch or two of clearance.
When you loosen the bolts that allow the bunks to pivot, just loosen them enough so you can barely make them pivot. Then drive the boat on the lift and crank it out of the water to put some weight on the bunks. This should force them to pivot and conform to the boat hull shape. Lower the lift, move the boat off the lift (don't work underneath it), and tighten the pivot bolts to hold the position forced by the boat hull. Do this before you spread the bunks wider apart. This way you can get a better idea how far your can spread them before the v-hull and your running gear are getting too close to the cross beam.
Is that a Hewitt lift? I am ordering my second Craftlander lift tomorrow. Was very happy with my first Craftlander, and now need another one.