ARP fasteners come with a spec sheet, use it. If for some reason you don't have it then call them. Studs are 90+ with moly... I don't recall the precise number but I know it's been posted a number of times in the past (a few times by myself).
EDIT: Go figure, it's in the FAQ and I even posted a link to ARP's PDF of the included instructions... This took all of 10 seconds to find, c'mon guys.
http://www.toyota-supra.info/forums/...and-studs.html