As for the old iron to iron gas engines, seal or don't seal, your option. If forced to reuse a head gasket then I would recommend a thin coat of spray sealer
Proper cleaning, chasing the bolt holes, wire brushing threads, checking for flatness, proper sequence, torque, and retorque is the secret to success.
If you do use sealer, be very stingy with it! What you don't want is a heavy thick coat that will get trapped and temporarily "float" the head and slowly spread out with heat, leaving the bolts loose. The other danger is closing off steam vent holes or the oil port to the rockers(if equipped). That's why I prefer the aluminum spray paint.
As for late model engines, aluminum heads or block, or diesels, there will be engine specific procedures, step by step requirements that must be followed to the letter! My experience with aluminum heads in general, always get them leveled and check the cam bore alignment if it has been overheated.
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