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I'm fairly certain you do not need "351w swap" headers for your 67... your engine bay has the same dimensions as the later 69-70 which offered the 351w as a stock option. The swap headers were made for the 65-66 Mustangs which had a smaller engine bay.

That said, unless you are a serious racer I would go for the JBA shorties. I used them on my 69 with a 393w stroker and they are a comfortable fit. I have far more power than my tires can handle, so I do not regret choosing shorties over long tubes.

In my opinion, the use of 2.25 exhaust is more of an issue for your build than the shorties.

Good luck,
-Rory
 
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