Help on 408 build

After checking your cam specs, it’s apparent your building a boatload of cylinder pressure at low rpm. It specs at 219/227 @ .050 with 112 LCA and is listed as a towing with 200 rpm or inboard/outboard cam. I really think the cam is at least two sizes too small and you’ll have to bleed some DCR to keep it from pinging. Put an A/F meter on it first and see if your around 12:1 on acceleration and somewhere close to 14:1 at cruise. But I bet that 408 is running out of camshaft before 4500 rpm right now.