Your IRA distribution and Social Security payments are subject to the regular rules of taxation. Being out of the country does not make those payments tax free.
However, as Don pointed out, the regular way that Social Security is taxed depends on your other income, so part of that may not be taxable, depending on all of your other income and circumstances. But that is just due to the regular way it is computed, it has nothing to do with being outside of the US.
If your foreign income is over $32,000, most of your Social Security will be taxable (and all of your IRA distribution will be taxable). Also, the 'excluded' Foreign Earned Income will likely put your IRA and Social Security into a higher tax bracket.
The best way to see the results is to enter all of your estimated income into TurboTax.
