I would go for a 2mm anyway for a turbo application, the 1.2mm will up your compression a little bit but I cant see it holding up to higher psi. As toneloc87 2 said, it dose depend on how much metal is taken off the block and head as well.
My preference is HKS for a MHG, but its really up to you.
Good luck.
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Whats in the garage, well.... in the yard.
1986.5 Toyota Supra - NA - 5 spd
1986 Ford Ranger Lowrider - 5 spd
1984 Ford Ranger XLT - 7" Lift - 4X4 - Auto
"Stuck in the 80's"
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