What head gasket for boost? MLS leaking oil
Where exactly are they leaking oil ?
Yes where is this leaking? Between cylinders 6 & 8 and between cylinders 1&3?
10 psi is not a lot of boost. I've run 14-15 psi racing and had no problem with standard Felpro Permatorque head gaskets. (Mitsu 2.6L, iron block, AL head).
Something is not sounding right. Maybe time to use ARP bolts; clamping force is a lot higher, maybe 50% or so.
Do you have a boost gauge on this car to verify peak boost? Is there any boost relief on the system, or is this just counting on the gearing and belt ratios to control boost levels?
Also, examine the pistons for any signs of detonation. That can blow out gaskets. (But I am not sure how it would cause leaking oil.)
