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royale 75

turbo 350 vs 400

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How can I identify the 400 vs 350 turbo? I am putting a high perf 73 Pontiac 455 into my 75 olds delta 88 which has the factory 350 4 bbl and whatever tranny came with. Tranny is excellent and has only 80k miles on it so would keep it in if it can handle the power of this 455. I have the Pontiac tranny and assume it was a 400 on this originally. Although it is alledged to be rebuilt, don't want to take the chance if the orig olds will handle the job reliably. Any advice?

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