Not sure about some of those things, but I do know that if it had side pipes, roll bar, hood scoop, it was no longer considered a street car. Equipped with those it was considered an SC. I think that also the street version came with two 4 barrels as opposed to 1 in the SC. As for one with an 8 track and hot tub, I hear that Shelby actually produced one of these and it was seen on Rodeo Dr. in Cali!!
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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
