Sunshine, the more I think about this the more I agree with Gearhead. 351W heads may have slightly different water jacket holes and do have an extra intake mounting hole, but the exhaust ports should be in the exact same place as the 289 port faces. Were these for sure 351W heads? Let us know what you find out on this.
Rev
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'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.
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