Whew, finally getting to the actual replacement of the mounts which is actually quite easy. To make this task easier I use my favorite scissor jack. This jack came from a Honda CRX I owned in high school. I loved it so much I kept it when I sold the car. This little jack folds to about 2" tall making it easy to slide under even the lowest motors. These can be found in junk yards and will be the best $5.00 you ever spent.
There was yet one more problem with this installation the stud on this front mount winds up behind the lower crank shaft pulley. When the boat is put in gear and the motor moves slightly forward under load the studs threads grind on the back of the pulley. In order to prevent this the stud needs to be cut shorter to clear the pulley once the engine is in alignment.
When jacking a motor be sure that any hoses, refrigeration belts or other items that can impede the raising of the motor are disconnected. You'll also want to loosen but not totally remove the top nuts on the other mounts to facilitate the motor being lifted enough to get the mount out. Removing the old mount and sliding this new one in place took all of about 10 minutes.