wastegates and BOV's

I have a twin turbo twin intercooled LT1 engine for my boat. I bought the engine from a boat racer from Southern California. Question is: Do I need twin wastegaste's AND BOV's (one or both items required?) to keep the engine in check. Right now I have neither. Rajay turbos and a PFM Marine turbo setup.

One or two wastegates per turbocharger to regulate boost pressure and one or two blow off valves depending on the setup.