I'm not familiar with those headers, but 351W heads on my original 289 block fit fine in my '66 Coupe. I'm using Tri-Y headers though, and have about 1/2" clearance with the shock towers.
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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