According to Goldberg's memoir in Robin Snyder's The Comics, Vol 14, no 1, January 2003, Modeling with Millie #8 was the last issue he worked on but there is no such issue so he probably meant Mad About Millie #8. His website says he left Marvel in 1968, but since he is credited with interior stories all the way to Mad About Millie #16 (November 1970), perhaps he was incorrect about both the issue and the date. The fact that his first definite DC work is in Date with Debbi #13 (January-February 1971) seems to back this up. It should be noted that starting in issue #10 the stories have job numbers (#1-9 stories do not), the art does not look to be the same artist as in #1-9 (minor characters do not look like Goldberg's style and the backgrounds are essentially blank spaces), and even the "Stan G." signature looks a little different.
Art probably not by Stan Goldberg.
Note that "Solly B." credit from the original printing in Millie the Model #158 has been changed to "Stan G." here. This may mean that Stan actually did the art, or that it was changed to keep consistency with the "Stan G." on all the stories (even though he probably did not do the art in all of them).