I will tell you the timing makes a huge difference. In the 1/4 on my first pass the motor laid down in the top of all gears and would barely pull over 5000 rpm on that pass I I ran a 13.86. Long story short I have a fluidamper that has a chevy marks on them and I had my timeing way off. After fixing my timing and jetting the carb up to steps all the way around it went out and ran a 12.55 at 113 spinning the tires at every shift even into third.
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67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4.
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