i blew a set of felpro replacement gaskets (came with re-ring kit, not sure if they aare 8548s?) with my old untuned combo (thumpers, b-cam) and 9 psi
ran great but i didnt have any BTM or anything and was getting too much spark and ended up blowing a HG, took a few months but it did go.
currently i am running the 9333s and they seem to holding fine, got a little hotter combo now, TW heads and f-cam with 10-11 psi and this time i have control of fuel and spark so i am in the safe zone. no problems yet.
i would think 99% on blowing HG issues are more tune related or installation error than the actual gasket itself.