I have just switched from the 10" continental 3200 to a 9.5" TSP 4800 and gone from 1.60 to 1.52 with no other changes. It put me in my torque band much quicker and has really helped.
Can I ask what shocks you have on the front?
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69 Firebird
472, KRE 85cc, Victor, 850xp, TH400, TSP 9.5" 4800, 3.90 10 bolt, Viking DA rears, QA1 single fronts, 3558lbs. best to date 10.90 @123
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