Changing the head gasket on 3 cyl ford diesel tractor?

i am changing the head gasket on 3 cyl ford diesel tractor.there is no way we can get the block and head decked, and it%26#039;s a little bit rough. what i would like to know is, should i put it on dry or should i use Permatex庐 Copper Spray-A-Gasket庐


Hi-Temp Adhesive Sealant (approved for Cylinder head gaskets, carburetor gaskets, exhaust manifold gaskets, high temp applications


Temperature Range: -50掳F to 500掳F)


or Permatex庐 Super 300庐 Form-A-Gasket庐 (approved for Valve cover gaskets,compressors,diesel engine heads Temperature Range:-65掳F to 400掳F)


or does anyone have any suggestions


thank you very much.|||Clean up both surfaces as best that you can (preferably with a rotating Scotch disk) and install the gasket without any other sealant. 500 F degrees isn%26#039;t sufficient specification for a head gasket regardless of what the tube or spray says. Be sure to torque it to specks in the sequence shown in the manual. |||just use the gaskets them selves, any spray can distort the sealing surface creating a leak. go dry for the head gasket but the others, i would go dry on those unless the book called for otherwise.|||Make sure the head isn%26#039;t warped. That is what usually causes the head gasket to blow. I wouldn%26#039;t put anything on the gasket.