170 & 225 head swap?

Okay so I picked up a head gasket from Napa, and the guy at the counter said I should use this aerosol copper spray stuff on the gasket, block and head before assembly so it seals better so I grabbed that too lol, but I dont know if I need it so thought Id ask here.

Also, can I reuse the head bolts or should they be replaced? Anything else I need to know?
Ive looked for some videos on this but the net is kinda sparse on such content, Idont suppose there is a tutorial somewhere someone could point me to for more information?

Thanks guys!