Glenn
Looks safe to ID this bird as N30L c/n 3772
N30L msn 3772 definitely puts it in the contract serial range 42-58110 thru 42-58540, although it is not shown in Joe's list.
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Seems this other listing from Joe Baughers site is incorrect:
1941 USAAF Serial Numbers (41-1 to 41-6721)
41-005/037 Cessna AT-8
41-030 flying as N30L. Seen at Freedom Flight, Aurora, Ill 8-5-95.
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The two images below, borrowed from, the Bamboo Bomber Club Newsletter #3 March 1996, explains how this could happen.
It also gives some insight to the color scheme and markings on N30L at the time you took the pix.
AT-8's had c/n (msn) of 1030 through 1062 (33 built in contract batch 41-005 thru 41-037).
Hope this clears up another little mystery...
John