best way to get header studs out

Hey guys, the admin of the truck site hasnt given my rights to post yet, so since its just a 360 any way i will ask here. 84 Ram Charger.

I ordered new studs from Summit. What is the best way to get the old studs out? Soak in PB Blaster for a bit? Remove cold or after the motor is hot?

The engine has a set of Hooker Headers that are leaking on the right center flange, already ordered some Remflex gaskets.

Anyone know where to get a new engine harness? Why does everyone always hack up the harness?