So I had the new bolts and when I went to put them in the old bolts had loosened up some already, especially the back one. The new bolts are a little shorter and the slight difference made it impossible to thread in the rear most one with how hard I had to fight the header. I had to reuse the old one for the rear but all the other on the passenger side are new. I also had the idea to double gasket and read mixed opinions about doing it online. I went for it and feel like it was a good move although maybe just temporary until I can get a thicker aluminum one on it.
I drove maybe 10 miles after buttoning it all back up, went out the next day and figured I'd just check them- I was able to tighten them every single one, and I had used a breaker bar to tighten them the previous day. About to go see if they loosened up any more.
I also have to figure out what's involved in the bracket that goes over the front most header bolt on the driver's side so I can replace that gasket.