Yeah the HT wasn't too bad for getting in a 4 wheel slide when taking a right angled corner and still making it around the corner but the same corner and the same speed with the 1988 XF and it would just under steer off the road.
I have a write up on the comparison between the standard HT 350 Monaro and the A9X 308 Torana, The RTS front was better than the HQ but the HT went around corners without the under steer of later models.