Premium intake/exhaust gasket.  The best quality available anywhere! Trouble free.
Included in our premium gasket sets too.
 
Since we work on so many roadsters, we know that changing the header gasket is a pain and suggest using the best gasket you can buy!
 
If you want a low cost/lower quality header gasket, we have those here:
 
Low cost Header Gasket U20/2L | datsunrestoration (datsunrestorationproducts.com)