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My friend has an 87 with a 307 and a 200R4 Overdrive stock. If you have the overdrive unit, which I think you have, I would beef it up if you plan on going to a 350 or 403. It would be more expensive than building a 350 or 400 Turbo but you would be quicker off of the line and cruise at a lower RPM.
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Darrell
1971 Cutlass Supreme
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