Exhaust and tunning

[Qckslvr]

So after listening to some more sound clips and reviews of the FVD Brombacher Sound Version, I ordered one. Along with a used set of headers and test pipes.

Now the last set of questions I have.

Should I use a traditional header gasket or the OEM stamped metal gasket. I know from experience that early Fords would crack their manifolds or damage the head if you used a header gasket. It prevented proper heat transfer from the manifold to the head.

Also should I wrap the headers and the test tubes with header wrap? Good or bad idea?

I am keeping my fingers crossed that no bolts decided to break on removal. I am skilled at bolt removal.... but what a pain.

Also are the exhaust manifold bolts/studs 6mm or 8mm? Dave mentions 6mm, but other sites say 8mm. I would like to be prepared for my project.