July 30 (Reuters) - Rating agency Standard & Poor's says:
* Revises outlook on Fiat Chrysler Automobiles' (FCA) rating to positive from stable
* May raise Fiat Chrysler's corporate credit rating by one notch to 'BB' within next 12 months
* It would raise rating if FCA removed remaining contractual restrictions limiting free flow of cash between FCA and its U.S. subsidiary
* Sees Ferrari spin-off plan as slightly negative for FCA's overall credit quality Further company coverage: (Reporting by Milan Newsroom)