The MK4 engine is basically the same as fitted to the SS100 – it is an overhead valve engine as opposed to the later XK overhead cam.
Sadly, I have noticed that the alloy rocker cover has a hair-line crack between the clamp bolts which is disappointing, after a number of discussions with some specialists, I have found someone who can laser weld and say they can repair the damage.
During that discussion, I mentioned to an SS specialist that the steering has an awful lot of play even for a vintage car, and having sat in a restored MK4, I now know the steering box needs some serious attention. Luckily that specialist said this was a common problem and he manufactures the parts to rebuild it.