Overfilled, your procedure is correct. I've heard of some people filling them by removing the shifter and adding from the top. Not sure why anyone would want to this but...
Finally got FDA approval for the test I've been working on for the last six years!
http://www.fda.gov/NewsEvents/Newsroom/PressAnnouncements/ucm455813.htm
We're these trim rings really available? The post says they came from an '86 but have pentastars. Are they Dakota lights? I'm viewing them on my small mobile screen. Never mind, they've been pulled.
http://m.ebay.com/itm/252031170914
No rattling on any, and I forgot to mention the one on my 89 is broken. But it seems to me it is a good idea so the pipe doesn't move relative to the manifold.
My '90 with the AX15 does not have it and I've had it since new, my '89 with the AW4 has it and my '88 with the BA10/5 does not have it, but I don't know if it was removed.