Does his 6.0.1 require 99.3b recovery?
Also, when installing a tar, it always does an automatic "pre-install" nandroid backup. If there is not enough room on the sdcard, the rom will not install.
It must be something - lots of people installed that version without problems.
I didn't think about the tgz making a backup prior to installing, good call on that one. Do you have a lot of nandroid backups in your nandroid folder on your sdcard? Maybe deleting a few of them will help, you can (and should) back them up to your PC.
The rom.tgz file does NOT go in the nandroid folder. It goes in the root of your sdcard and then you choose the "install > install from sdcard" option in recovery.
EDIT: aren't there install instructions on Adamz's post/thread? You should use those instructions, and perhaps post on an Adamz thread - not that we mind helping in this thread.
I couldn't find a thread specific to Adamz roms. I have 9.34 GB free on my sdcard. I did try to install it from the root of the sdcard. I even tried re-downloading it to see if maybe I had a corrupt copy. It's just the 6.0.1 that doesn't work. I figured this would be some simple newbie mistake on my part, but the other roms I've installed this way have all worked.
... perhaps you cannot start a new thread though until you have at least 1(?) post. So just post on the actual thread (which is where you'd want to post anyway).
Not that I care - I don't much like alldroid.org and their "closed" atmosphere anyway.