1969 273 upgrade advice

Does it still have the point style dist in it ? If so that would be the first step to help the 273 engine, so change that to electronic dist.. then I would change the intake to a 4 barrel dual plain intake and try a 600 cfm carb on it.
Do a good tune up and set the valves , check if any bearings are dragging the car down in the rear end (Keep it smooth) u-joints and check brakes.
All the members here are on the spot right on the upgrades, but what I just posted is what I did to a early engine and it woke mine up . The How To page has a bunch of good advice in it as well Articles | For A Bodies Only Mopar Forum