You can play at 60fps with V-sync off. FH3 did not have this option. I have 120hz with V-sync off, I can select 60fps instead of unlocked framerate. As soon as you turn v-sync off it automatically selects unlocked framerate. change to 60fps.
I even changed the refresh rate to 120HZ to simulate your case, but the 60FPS option doesn’t appear. Only options equal or above the refresh rate are available…
If refresh rate is 144hz, only 144 FPS and above are available, with the last option being unlocked