Replaced two heads ,head gasket and several other gaskets .galleons of water and oil .and when I put her all back together last night she ran like a bag of ball bearings in a washing machine .. But I carried on this morning and re-torqued the head bolts and now she runs like a dream and no water leaks .the bad running last night might just have been air in the fuel system .So another one lives to fight another day

forgot to add that the superb write up from Keith (Rifleman) on the subject was a great help ..