Studs front and rear in manifolds?

I was thinking that also, got I hate headers but what's a guy to do.
manifolds also have their own downfall.

The headers I installed on my e body in 1981 are still in good shape today,
I guess I can take comfort in knowing once they are done, I wont
bottom out on everything and it's hopefully done for good!

What do you guys use for sealant? Permatex II or silicone?