I did the same thing, and called Ridetech last week with a "WTF"? I did get some answers right away.
The way we see it is the wheel tub, and the frame positions are not moving anywhere. So there is work that has to be done to make a 10" wheel clear without any rubbing, so lets not all start jumping for joy yet. Even on the 48 hr camaro, the tire does barely kiss the frame at full lock, and they did do work on the outer fender to help clear the 275 front tire. So I'm not going to go and start recommending this as a "fit" as I'm sure as soon as we do, someone will post up another 3 page dissertation in regards to how we said it would "fit" and it doesn't.
Until we try one, we're not going to recommend putting a 275 on the front of any of these cars, unless the customer is well aware of ALL the facts, and that there is a fair amount of modifications to make it a steetable fit.
All that being said, we would still not recommend going wider than an 8" wheel with a 235 on a stock subframe. I'm sure the Ridtech system is going to help, but until we can get one installed, and physically measure, can't tell you exactly what its going to allow.