Exhaust studs with headers?

Can I retain and utilize the outer two exhaust studs to use with Dougs headers on my 68 340 Dart? Those two gave me fits trying to pull them last night. I'm assuming they are rusted in place from the water jacket. Can I just keep them in, or will the headers not slide up and over them??? I'd rather not break the studs off if I can help it.

Thanks!