FelPro 1009 for head gaskets; for headers, I always cut the excess flange off so it doesn't warp, which usually improves spark-plug access, and improves appearance. Gotta make sure the sealing area on the headers is dead flat, which isn't hard to do with a flat file. Then depending on the car, I either use the orangish high-temp silicone or a good soft gasket with a light film of sealer/adhesive. Remember to seal the end studs, as they go into the water jacket, and a little anti-sieze on all header bolts, even at the collectors. On the intake side, opinions differ between using just the tin bathtub gasket or not, but I've used some .015" paper gaskets on them for decades and have never had an oil/air/vacuum leak since. Had those made for that purpose.
