Originally Posted by an8sec70cuda
Teflon paste like Permatex.


This has worked for me as well.

As mentioned, you will get much more reliable sealing with studs vs. bolts.
I can attest that they make fitting headers more challenging on a BB B-body, but it can be done.

1969 Dodge Coronet Super Bee 383 A4
1970 Plymouth Road Runner 440 FC7 (sold)