Your carb is a major restriction. You should run at least 750 CFMs. Don't go Edelbrock. A Holley will make more power.
You will need a bigger cam. If you get over the .550" lift and 240 @.050" range it will make a big difference. You have the compression high enough that you could still maintain a decent idle with a cam at those specs.
Find areas that you can lighten the car.