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Yes, it is easy if you have a complete engine to swap. The only differences are the flywheel, starter, exhaust manifolds (really close to the same, can be made to work) and placement of the carb if we are talking about a second generation f body with a shaker scoop. The 301 is a short deck version of the traditional Pontiac V8, and as long as you are swapping the entire engine there are few issues to deal with.

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Q: Can you swap a Pontiac 301 for a 400?
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