What engine do you have? 3.0, 4.3, or V8 (5.0, 5.7)? With any of the V engines you may need to remove the exhaust from the starboard side to get better access. Depending on the boat layout you may need to remove some of the rear panels.
I am 6'3" so I understand how tight it can be working on boats.
1997 2400 SCR
5.7 Vortec / Bravo 2