Cat 7-A are the ones that have the obstructed view. Cat 8-A should not have any obstructed view. I have booked a guarrantee 8-A on the Legend I think it is same class ship as yours) and was told that there are no obstructed views with 8-A, just 7-A. I found this photo, It 8-A on the Miracle. It is out of focus, but I found it on a web site.
Carnival legend November 2009
Carnival Glory October 2007
Carnival Elation November 2006
There are no lifeboats below or in front of cabin 4169. Your cabin is in a great location. The cabins where the lifeboats are located are inset from the side of the ship. Yours is more flush with the outer lines of the ship and will have a very nice view. You might see them some looking fore and aft, but not a bad as the cabins that are inset.