Hedman sells some nice 3/4 length 351W swap headers for putting a 351W in a 1965-66 mustang. These aren't RACE headers. They are designed for street cars. They fit well, and are minimally intrusive. They are also inexpensive. (around $160) or something.

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66 Mustang, Toploader 4-speed
Pump Gas 306, 10.157@133.68
[url]http://www.mustangworks.com/cgi-bin/moi-display.cgi?220[/url]