Yes, I'd look for bent/broken/damaged parts first. Do you have a Bentley or Hayes manual for reference?
The current springs may be tired & sagged if they are original, too.
Like Doc says; there was not much ground clearance to begin with. These were never intended for off road adventures.
Circa 1972, the front springs were changed. Check the Moss catalog, their front spring 264-375 is up to chassis 293445. From there to the end of the chrome bumper cars (chassis 361000) is Moss part # 264-380. The later springs sits a bit higher. All chrome bumper GTs use front spring Moss #264-390.
For Chrome bumper cars, there are just GT or Tourer springs.
Bear in mind the GT springs have a slightly higher spring rate, (as the GT is slightly heavier) so it's going to ride a bit firmer. You will also raise the center of gravity a little, also.
Colin