Well since you already mentioned one eagle, I'll throw another out there.
King Dunlap, the Eagles backup OT is listed as 6-9 330. I was standing by him at the Eagles training camp 2 years ago. He is BIG dude.
[edit] A quick google search of "tallest player in nfl" lead me to this...
http://bleacherreport.com/articles/7...-each-position
For those that don't want to follow the link, the tallest player in NFL history was...
OAK DT Richard Sligh who was listed at 7'0"