What Gen III Hemi dipstick tube are you running with a swap pan and headers??
FYI I got my pan and dipstick installed, same Holley one that you have in your original post. Factory valve covers fit the same. I just re-used one of the taller valve cover studs that I removed off the engine in the first place and it fits perfectly. I'll snap a picture later, don't have my phone on me at the moment.
Mike @ HCA