I think the question is, "Will it clear the rear fenders without cutting?" Obviously the wheel itself will not be an issue.
With 3" of BS, but unknown offset, you can't be exactly certain without a dry fit. The stockers would have had an offset of -1 but a "higher" backspacing. This means that the wheel would be closer to the frame with the stock wheels.
In other words, all things being equal, the same wheel will be 1" closer to the frame with a 4" BS than with a 3"BS.
Hope that helps...