I don't think it would hurt anything to add a few shims to get it "on the target"…

Claude.

 

I'm gonna assume if the I move the pinion in more it will howl until it wears a new pattern ??

 

the pinion depth should allways be confirmed by the pattern and if the pattern is off but the depth is correct then it needs corrected. on used gears this is especially true. in your case if the gear was quiet i would put it back like it was

 

MANY, MANY years ago I bought a pinion depth tool (before then, I strictly went by the contact pattern). I used the tool 2-3 times, but it back in the box---------------it's still there.
I have returned to setting my rears only by the contact pattern. A LOT of the rears I do are with used gears. I'm of the opinion that pinion depth specs are worthless with used gears, only the pattern tell the true setting. And YA, YA, YA, YA, YA, maybe my method requires tear down 3-4 times, but when I'm done, it's whisper quiet. Besides, since I'm retired, I got nothin' better to do.
Also, with used gears, it may be impossible to get a textbook pattern. So I set it up until I get what looks like an acceptable pattern, then tear it down again, add .002-.003 shim and check it again. If that causes the pattern go go the other way, then I know what I had before adding the extra shims was the best I was gonna get.
By the way, while I'm on the subject of setting up rears, I MUST give Freddie Byars (Big Gear Head) and Lionel and Chevelles (Tory) lots of credit for assembly tips.

 

Ya I know pattern is the final guideline I just used the checker to see where it was before I took it apart I think the pattern could be better ?? its a full contact not sure if my picture good enough to see would like opinions on the pattern