After some further searching, the chart with torque values for various alloys is indicating a "recommended" assembly value. So this chart may be somewhat conservative in its application. But for the record, I followed this chart rather than the other one.

There are other threads throughout the Forum on this breather cover repair. I know I've replied on several others. So there is quite a bit more in & around here to provide you with other perspectives. Here's one of the better ones I found: Valve Cover Leak

I'd recommend you search a little further and then use that combined information to decide on a path forward.

Later,