Need some help!!

Newby here, have a 2004 350z with a blown head gasket. I was wondering if its best to rebuild the engine or to just replace it. Thanx for your time and advice

if it don't burn oil up i'd replace just the head gasket if you know that is blown for sure? do a conpression test on it first if you haven't already? but if it does burn oil then i would go with new moter.