Stroker 340>416 Build Advice

I bought the exhaust for the 318 that's in it now, been running it for years. Haven't even assembled the 416 yet and just wondering if I should run a different cam, I could redo the exhaust but I'd like to at least drive it first so I have some kind of baseline. I do appreciate the advice, the cam is still in the box so that's one thing I could possibly exchange easily.