408 build

You're gonna have some decent cylinder pressure closing the intake valve @45 or earlier if they used the usual suspects when it comes to piston choice. If the heads are made to work right, it'll make some good torque. I would consider better exhaust valves when the dynamic is high on pump gas.
Hey MO. What would you consider to be 'better exhaust valves', and what is the particular reason to change them under these circumstances?