How much income can you have and NOT have to repay ss for benefits - you are 67 born in 1945 and income is from 401K?

There is no income limit once you're over the Full Retirement Age. If you are 67, you're over that limit today - Full Retirement Age for folks born between 1943 and 1954 is 66.

In addition, 401(k) distributions are not considered "earnings" for the purpose of the earnings limit for Social Security benefits. Earnings counted toward the earnings limit (for those under Full Retirement Age) includes wages and self-employment income.