Omc/ Mercruiser swap

My brother has an old Cris Craft that came with an OMC 3.0. I picked up a Mercuiser 3.0. We stripped out the donor boat last weekend. Now the tough part begins. We had to use the OMC bellhousing so the motor mounts line up. We didnt want to swap out the outdrive.

The couplers are different and since we had to stick with the Mercruiser coupler, we shimmed out the OMC bellhousing for clearance.

We still have to figure out the connection for the trim pumps but thats minor.

What are the chances of lining up the input shaft with the coupler? I figured, put the outdrive in gear, spin the propeller to turn the shaft to help with alignment.