You can reuse ARP so long as you oil the threads when you tighten them to a final 120lb ft.
A water leak IS what you get when the HEADGASKET GOES between the water way and the outside of the block but it IS still the HEADGASKET GONE!!
They suffer, especially 2wd from localised BOILING of the water here around no4 as it runs HOTTER and LEANER than 1,2,3!!
tabetha