idler arm interference

When all else fails
Switch to the 73 up system
Which has the balls in the same place but the studs point down.
The matching parts are; the two arms and the center link.
But before you go there, make sure your current steering arms are being stopped properly, so that she is not over-steering.
And make sure the two steering arms are the same length, from the centers of the pivot balls to the centers of the pivot bolt on the idler and the center of the sector-shaft on the pitman.