Stems should be made tight enough that it requires a fair amount of force to twist it sideways if you stand holding the front wheel between your knees.

Less than that is mildly dangerous 'cause it might slip.

More than that is unnecessary, and can lead to unnecessary damage in the event of a fall. In a fall, the stem should be able to move sideways when it hits the ground. This can reduce the risk of damage to the brifters and/or handlebar.

It is silly to use a torque wrench for this application.

Sheldon "Tight Enough, But Not Too Tight" Brown

The torque spec is about 50 inch-pounds on each bolt. That's tight-but-not-too-tight. With threadless stems you not only want to keep the stem from rotating, you don't want it to slip upward which will upset the headset adjustment.

Mr Brown and I disagree on the value of torque wrenches, particularly for inexperienced mechanics and for use on delicate parts like carbon steerers and stems.

Thank you for your help!

As I have a Torque wrench at hand, I will go with HillRider's suggestion.