[geezer#99]

And that’s the safe way to do it!
Setting your timing by following the all in idea works great at up to 1000 foot elevation. Once you start getting up higher you need to rethink your timing and jetting. You need more initial to start the burn earlier and leaner jetting. Most people do nothing about either one and wonder where the power went.
You’re optimizing your carb, I just thought you’d optimize your timing too.
Optimized timing could totally change your carb settings.
But like you said, it’s just an old plow truck.
Best to time it conservatively.