because all tracks were recorded with the same digital clock (in this case, the same deck), NO time stretching will be necessary. Time stretching is only needed when trying to mix channels recorded with different clocks, and over time, the signals get slowly out of sync with each other.
However, because of a small amount of time delay between the sbd and the aud recording, you may have to shift the aud recording ONCE (at the beginnging) to line up with the sbd recording. Once the two are lined up, however, the recordings will stay synced for the entire set.