Progress Report -
Got one head off (the easy one, passenger side). it had two bolts stuck. used the supercrack - not sure what exactly it does, was told it freezes it? anyway, its off. split another socket on the drivers side bolts, apparently has a lifetime guarantee, lasted about 30 seconds! still 3 bolts holding it, and they are the difficult ones. i think they are rounding too much, bring on more tools (irwin remover)...
good news / bad news is that the gasket was like brand new. really though, i knew that anyway, cos all the problems are drivers side.
give it another crack in the morning