It doesn't matter how long the eye relief of your scope is if you do not use extended rings so you can make use of that long eye relief. Variable power scopes have long eye pieces that tend to extend well behind the rear ring, so my choice would be to find a fixed low power scope, or get extended rings for a low power variable.
The recoil pad on the wood stock Ruger looks a little thin to me, so I think the installation of a Limb Saver is a good idea. But as said above, it won't do much to improve the eye relief, and if the rifle doesn't fit you, the recoil will feel worse than it is. If you are going to have the better pad installed, make sure the stock is cut to fit you.