Which body for best performance?

The post Valiant can be a cool street rod or road race type of car. Not as popular as an E body car so it is harder to find parts and they are a bit smaller so stuff can be a tight fit. I spent a lot of time helping Tim with his red Valiant. That car was a beast once we put the 427 in it. 160 mph on the front straight at PIR and I think he might have hit that on the freeway a time or two!

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Is it a stroked 383 or 400? How did he end up with 427ci?