The problem with the original Leatherwood one point is that it is fabricated of aluminum, which walks (allows shifting which changes your zero). It was addressed by a 2nd generation mount which had a secondary mounting point on the modified clip guide. However, being aluminum, it can also walk.
IMHO, the best scope mount available for the M14 is the Brookfield precision mound which is fabricated of steel. Having two mounting points, it is also very stable. Unfortunately, it also costs about twice the price of both the GI ART II mount or (the privately owned) Springfield Armory two point mount.
The final caveat is that while the GI ART II mount and Springfield Armory's mount appears similar, they are not compatible. I only know this because I have the former and in searching for a modified clip guide, was informed by Springfield Armory of this.