Cool. That should put you with about a 1" variance from the pitman to idler. Might still want to look in to that further to understand why there is such a large variance. On my Challenger with the longer fast ratio arms, I've got about 1.5 inches clearence on both sides. I'd recommend making some measurements from the ground to the K frame bolts, ground to some frame locations, ground to motor mounts, things like that to see if things are all on the level. It could be your engine just sits lower than normal, your ppitman as a little high and your idler is a little low. After all, these were mass produced vehicles that are 30+ years old.
To alter the idler location to match the pitman is a much tougher job. You have to remove the idler, slot the mounting hole, then weld a washer to relocate the mounting position. This is a pain with the engine out, so with the engine in place would be a major hassle.