So, does that mean a B29 flying counts against the treaty for
delivery systems since the B29 had a model that was nuclear
payload capable?

Probably not, since the 29 wasn't designed as a nuclear delivery
system, while the 36 was. (Well, okay, so it wasn't; but it was a
nuclear delivery system from the day it went into service. As I
recall, its first operational test was to fly from Fort Worth to
Hawaii, drop a 10,000-lb block of something into the ocean, and fly
home again without refueling. Wasn't that on Dec 7, to make the point
even more obvious?)

all the best -- Dan Ford
email: www.danford.net/letters.htm#9

see the Warbird's Forum at www.warbirdforum.com
and the Piper Cub Forum at www.pipercubforum.com