1/2'' wheel studs enough?

I don’t know what you been bending up, but after seeing video of your car run I consider 5/8 wheel studs as “viable risk insurance.” Probably okay without them, but you’re going quick enough that you probably are having to keep check on axles and flanges for cracks, too. I’m reminded of a picture of a strange axle flange that cracked stud to stud and sheared off. It had rust through 2/3 of the crack, meaning it had been there a while.
i posted some pics of the bent ladder bar bracket a few months ago.
5/8 studs and send it.

Machinist will need to do it so that it’s 100% exact. Or get new ones. Sadly. It’s hard to find good machinists anymore.
there is a good machinist 5 minutes from my place.
I’ve seen 2600lb Fox mustangs go 1.1x to 60 feet on 1/2” studs, with only 4 of them! Look for signs of wear or damage when you prep the car but I agree with @33IMP that at your weight you’re probably ok.
so far no bent or wear on studs.