Connecting Rod stud w galled threads

[Diastole]

Please advise.
I have a 1930 Model A engine that was Rebuilt 10 years ago and was put on a test stand and ran well for eight hours. I put it on a crate in my garage as a back up. I was told by the rebuilder that one of the connecting rods studs did not torque. The engine has been well cared for on the crate with routine installation of lubricant and turning the engine over almost monthly by hand.

The engine in my car cracked, between cylinders three and four. Common problem.

Therefore, I’m giving the engine I have as a spare a once over and I’m looking for advice how to fix the galling of the threads of one of the studs of my connecting rod. It will not torque and the nut spins.

As you can see from the picture the Babbitt is in great condition. The crankshaft is ground 0.030”. The valve seats are hardened and the valves themselves are new. Going over every part of the engine. The only thing I can find wrong with it is this one set of galled threads on the stud of the number three connecting Rod.

I’m looking for advice how to deal with this situation
1) order a new connecting rod. Accepting the fact that it may not be balanced with the other three.
2) braze up the threads and cut new threads, ensuring that I keep the Babbitt from receiving too much heat
3) weld up new threads to cut new threads protecting the Babbitt from heat.
4) try to remove the stud and replace
5) cut all new threads and use a smaller castle nut 1/2” -> 7/16”. Add a sleeve to cover gap
6) send the engine out and start over

Any advice and help is greatly appreciated

Diastole in the Smokey’s