This is not a problem to straighten. The threaded portion should not be hardened. You can test it by using a file and see if it cuts the metal. If a file can cut it you are good to go.
You sound like you have done this before so I don't have to go in extreme detail. To avoid damaging threads use an old nut and thread as far as you can by hand and then lock it in a vise. Apply heat to the bent area (Orange preferred) and slowly bend opposite the bent direction. SLOW COOL.
Roll it on a table and check for runout. Re-bend as necessary. After all the heating and bending run a die down the threads to clean them up. A buddy with a lathe would make this easier!
Let us know how you did!
Where Are You From? Indiana
Do You own a car built by Durant? 1927 Star Six Rumble Seat Roadster & 1927 Star Six Coupe