Only way to fill a exhaust port is weld it. Your not going to turn passenger car heads into race heads, and you wouldn’t want to. They would like performing badly on the street. That being said, even the worst mopar heads can be ported to flow 200 or more cfm which will support 400 hp or more. Your next biggest challenge is getting your intake manifold to flow as much as your heads. Its all about the combination.
