Doug's headers with studs?

You can probably run studs all day if you just jack up the motor off the K member (2 nuts) to change gaskets or whatever you do. I found that those end bolt holes that are open to coolant tend to be thinner/weaker than the others and I have stripped 2 of them out with bolts. You can always slot the header flange so you can just pull them up and off. You wont weaken that thick flange one bit.