It's baffling anyone would think a 3.0 Capri air filter (standard) would supply enough air to feed a 800 CFM carb on a 7.5 litre V8 lol
At 5000 rpm with a paper filter they require a 14" X 3.5" paper filter, it was fitted with a 10" X 2"

I'm hopeful it should be around the 350 hp 450 lbft mark now which will be ideal