Yes, the 1984 SVO was introduced with 175hp.
But after 1985.5 it was 200hp as advertised in ford's own brochure.
Believe me, I went through the hassle of trying to find 5 lug wheels to fit one back in the days that mustangs only had 4 lug wheels..........something about clearing the rear calipers, if I recall.
Now the XR4Ti stayed at 175hp.