1995 Pontiac Grand Prix blown head gasket

recently my head gasket blew on my way home from work (coolent in the oil was the give away). i need to know if i need to pull the engine out to replace the head gasket or if i can leave the engine in. basicly, i'm going to replace all the top end gaskets (heads and intake)
[img:d47936221a]http://www.2carpros.com/forum/automotive_pictures/199074_ENGINE_1.jpg[/img:d47936221a]