Found the problem

Bad valve job.

Looks like the pilot wasn't centered, and it took off more on one side of the seat than the other. You can shine a light in the chamber at the valve head, while spinning the valve around, and it's the same daylight in the same place. The valve is not bent, the seat is just low in one spot.

Oh well....

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66 mustang
302 4-speed 289 heads, 10.63 @ 129.3
[url]http://www.mustangworks.com/cgi-bin/moi-display.cgi?220[/url]
[img]http://webpages.charter.net/hotrods/stang2.jpg[/img]
[img]http://webpages.charter.net/hotrods/stang3.jpg[/img]