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A 383 with stock heads, good pistons, and the right cam would make good power with a 75 MM turbo. With eddy heads I bet you could make 700+ @15psi.
Doug

I'm thinking with a 75 mm turbo & eddy heads 700+ with 10lbs .


I don't think so.
Doug



is 75mm big enough to support 700hp? As for headers... I doubt they are going to matter much. It's not like you are going to be able to use anything off the shelf. I sure hope you are good at fab work. Otherwise you'll be paying somebody big money to fab up the hot side.