Stumble issue

I have a 69 Dart with a 1972 440 in it. My issue is that it has a bad stumble right off idle when I just try to pull out lightly and also when Im just cruising barely on the gas. If I give it a little more gas its ok or if I punch it, it will get better. Also I noticed that if Im at wide open throttle I get a little bit of detonation at higher rpms and when it shifts into 2nd it seems to fall on its face. It has an edelbrock 750. Has a mopar electronic ignition and timing is 18 degrees base and 36 total. Any help would be great. Dont know if my issue is timing or carburetor. Thanks!

Josh