idler arm & header clearence help!!

I have a friends 69 Dart in my shop now same old problem.I tried to get specs on the difference between the early and later idler arm with no luck.It has the later spool mount K member in it so I would have to presume it also has the later idler arm ????Ended up pinging the header (use two ball peen hammers) and grinding down the end rod stud as much as possible.Also grinding down the idler arm stud a little.Cheap *** headers anyway.I have TTI's on my demon and don't remember having this big of a problem
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