the Pima Air and Space Museum has restored their B50 (B-29 revision)

The Boeing B-50 Superfortress strategic bomber was a post–World War II revision of the Boeing B-29 Superfortress, fitted with more powerful Pratt & Whitney R-4360 Wasp Major radial engines, stronger structure, a taller fin, and other improvements.

found on http://www.warbirdsnews.com/warbirds-news/kb-50j-displayed-pima-air-space-museum.html