2nd Gen Camaro rear frame rails?

[super74]

Linka Lot :http://www.jegs.com/p/Competition-En...49702/10002/-1

I was thinking about using these frame rails in place of the stock, puny, stamped steel ones. The issue i had was when I was looking into the dse deep tubs I noticed you had to notch the frame? The rear frame is not that big to begin with, so why not cut out the stock frame rail and weld in these (a little closer together ) to allow for bigger tires i.e 315 /45 /17? Any thoughts for or against are appreciated.