For further info - I mentioned 100fps as a basemark because of LFS's 100Hz physics,there is no use of higher framerate as LFS can display max 100 different frames per second,anything above means duplicate frames.
And from personal experience (with laptop using 2.6GHz i7 CPU and GTX1060) I get framerate drop towards 60-80fps only on highly filled grid,when the field spreads out,it's back to 100 for rest of the race. So unless you aim for VR,the PC specs seems fine for good experience with LFS.