Congrats! Nice score.
Originally Posted by shupe13
I discovered the truss rod was completely relieved. After some work I got her pretty straight but the buzz is worse than I want so I think I'll replace the nut with a taller one or shim the one on it now.
The neck is not usually set straight in order to achieve the best action.
If you have not done any truss rod adjusting before, it might be worth watching this video on adjusting the truss rod.
Making the nut higher will make fretting more difficult at the lower frets and the extra downward pressure needed to fret the string can result in the note being sharp.
There are more helpful videos and info on setting up your guitar at Gretsch Support