How Much Boost for Cast Iron Internals?

Abodybomber said

Fuel system(s) / type of boost(Rootes/turbo/centrifugal supercharged???)/ expected reliability & power output/ and tunable/ what fuel?????.......

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Let's just say 91, turbo, fairly reliable (daily driver status), power = better than stock, and tunability doesn't matter. Basic build, nothing too radical.