How much does it cost to install head gasket and a block for honda engine?

i have a 97 honda civic ex just barely had for week and i blow a head gasket and block on my engine, i dont know if i should sell it or keep it and try to fix it. if sell, for how much?How much does it cost to install head gasket and a block for honda engine?it is very expensive, over $500 for sureHow much does it cost to install head gasket and a block for honda engine?just buy a used engine