All of the 403 aircleaner bases not only are a different depth, but the carb mounting flange is offset. Needing a a late '70's T/A aircleaner base for a traditional Pontiac engine, often easier to sell off the Olds base, & purchase the correct '77-78 400 or '78-79 W72 400 base.
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Buzzards gotta eat... same as worms.
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