I know that the 741 was still in use for 1970 models in addition to the 489.

There is a chart with the 1970 information at http://www.hamtramck-historical.com/images/TSBs/1970/D70-3-2%20page4.jpg

My 1970 Valiant has a 3.23 741 while my 1970 Fury has a 3.23 489 & both are open with the small yoke.

Both are called out on their broadcast sheets.