1998 4.3L V6 exhaust flange studs

My latest acquisition is a 98 Chevy K1500 with the 4.3L V6 Vortec. I'm going to have to replace/rebuild the trans soon so trying to get exhaust y-pipe removal out of the way.

I started using a torch to help remove the rusty y-pipe flange nuts but looks like they ate up the stud threads on the way out. All of the replacement sets I find (e.g., Dorman 03133) include plain replacement studs (with a small unthreaded shank portion near the middle). However, looks like the studs currently on the truck have a hex feature on the top that can be used to torque the stud.

I'll use a stud extractor and a torch to remove the old studs, but how to install these new plain studs with nothing to grab onto? Is the idea just to thread them in by hand with some hi-temp anti-seize and then just tighten the nut down on top until it's snug?

Thanks,
Alex