I never add weight, but often subtract weight when I run my car at the track.
If you can remove wt., then you can improve your ET, it's just that simple. Adding wt. could only help you if traction was a problem and you put extra wt. over the drive (rear) wheels.
Overall, a car will run faster et's with less weight. Really, a no brainer.
Rev
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'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi.
O.B.C. #2
'66 coupe
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