"I'd run 3.08's with the TKO600 (0.82 OD), and either 3.08's or 2.88's with the WR toploader." Posted by Anthony
My 2 cents, for what it's worth. I have read complaints from other members who are running toploaders. There seems to be a problem running the 3.31 or anything higher in these cars, as it makes creeping through a plaza or parking lot a case of the jumps and jerks or using the clutch excessively. I was considering going with the 3.31 but decided against it, because of this. Just my humble opinion

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"The 427 Cobra is easily the highest performance car ever sold for street use. A decent 427 - not the worst, not the best, will go from zero to 100 mph and back down again to zero in less than 14 seconds. All thing considered, you can put together a pretty good argument that the 427 Cobra is the ultimate performance car, judged on any basis you want to name." Taken from; Corvette, The Sensuous American