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I saw a 300 CID six with a turbo on it at a mini tractor pull several years ago. He was pulling against small block Chevy engines. I rember it being extremely quiet, and kicking the small block's tail! I know it's possible.
Great as it is there is always a want for more. The few 300s I've driven were great little torque motors, just not so great on the top end. We don't all use them for stump pulling all the time.
Those bilge pumps don't flow enough air to feed the engine, much less pressurize the air. A turbo would be great on a 300, and sized properly, it would enhance the low to mid range torque. A Vortech supercharger isn't what the 300 needs.