IRC 2009 Table R404.1.2(1) requires one #4 cont. bar 12" from the top of the found. wall and one #4 bar near mid height of wall. This is for wall heights less than or equal to 8'.
My thought is that hor. bars in a foundation wall give the wall the ability to act as a grade beam to help bridge...
I've been tackling this issue for a while now and have had some discussions with builders regarding these connections.
Best way to start this discussion is to view the following video:
http://www.askthebuilder.com/Valley_Rafter_Video.shtml
I'm set on using Simpson Hangers for this...