well i would be highly interested to see the results of your tear down if you do tear it down
i guess with a 7mge at least you know the fix for the hg's LOL... i don't even think that a mhg would be required on the ge... i guess you could do it anyway... won't blow ever then :P
72ft lbs on toyota new stock headbolts or arp head bolts i think is 75.. they'll tell you on their info sheet, arp head studs are 82ft lbs according to them