What headers work, and what don't?

What headers have people found to work with power steering? I was pretty sure TTI said they would work, but my problem is the wonderful previous owners swapped a 318 for the /6 and made their own mounts to put it in. They're spool mounts at least, but they're attached to a piece of angle iron on one side and square tube on the other welded to the K frame. Don't know if the engine sits in the stock location of not (doubtful). From reading the TTI footnotes on install it seems like they only guarantee fitment with the engine in EXACTLY the right spot. Is this really true or is there really a fair deal of fudge room? I hate to drop that much money on something that may not fit...