Damn. Sounds frustrating. Hope the kinks are all worked out soon. Agree that you need to discover why the stud broke. I would be going through and checking the valve lash and ensure the poly locks are set correctly. Unless other studs show sign of wear, you could probably get away with replacing just the one. Though a new set of ARP certainly not a bad idea.
1.7 is indeed the stock rocker ratio. Confirming what those rollers are is fairly simple using dial caliper or machinist scale. The image below should help: