there are many jap brand head gaskets out there ie HKS SUPER STOPPER which have a built in o-ring system which will run that psi and more safley.o-ringing the block seam's to be a cheaper way of doing things here in Aus i think the jap's would use it if it was such a good system.That's my 2 cents hope it helps.
wilkies done 3 cars of mine and every think on all of them has always been perfect,as well as advising the best options for what i was trying to achieve.I would go the extra distance and know the job is going to be done right the first time.
No it didn't come out on sunday but Micko and i were out on tue or wens night and had some fun on the way to see Ken.
One car went into the back of the other in a major way i wouldn't be suprised if they were both a wright off