[Tom Goldman]

You can use the 9" ends on the 8.8" in Stock as long as you maintain the O.E. width .
Since aftermarket discs are allowed, this is a common modification .
If its a low power car the 8.8 may be a little quicker ,and they surely don't lack strength , I've done plenty of them for cars with turbos and blower in them.
As long as you can get your ratio , I'd use it.