Headers on a 340 Cylinder 7

Hey guys,
So I was able to loosen my headers and pull them back a bit. The two studs on each end of the heads are problematic as they essentially pin align the headers not allowing me to put the other two tight bolts in first. So removing the two studs is a must.
I assume that these two studs are used because it keeps the coolant form leaking out. So I also assume that the only way to pull the studs prior to mounting the headers. That being the case then I will only be able to replace the studs with bolts. I also assume I will have to drain the coolant.

What am I missing? Is this part of the pain for using long tube headers?

Thank you for your responses!