and changing a head gasket? what makes you think it needs doing? may be unnessercery. not worth doing yourself, specially if head itself is warped(doubt it but will need checking or the headgasket changing will be pointless) you will need to have the timing checked and unless you have a timing strobe(and know how to use it!) or can use the top dead centre timing marks on the cam/pullys, i really wouldnt bother! and i dont!