Looking for a Standard steering column

Three on the tree with power steering is not a very common combination. You'll probably have to do what valiantpatrol suggests and that is to reuse your column and get a P/S shaft out of another. If your column is bad, you'll probably have to get two columns and make one good one out of them. According to Hollander, yours is a one year only column but I know individual parts are the same as other years. You may be able to use a '70-3 column with minor modifications. The '74-5 columns have more differences than the earlier ones but they might be able to be modified as well.
Good luck!