Depending on your budget you can do a complete engine buildup overhaul, My 1974 318 has Keith Black pistons which brings the stroke up to a zero deck, 360 heads shaved down to 63 CC, Edelbrock 650 carb with a dual plane intake. The cam has a wide duration so it's a slightly rough idle but all in all a nice street engine in the Dart sport for under 1000 spent on parts.