1975 Chevy Nova stalls when floored

Engine Performance problem
1975 Chevy Nova V8 Two Wheel Drive Automatic 39000+ miles

I have a 75 nova with a 262 in it. When you floor it quickly it stalls and will die sometimes. If you were to slowly take it to the floor it will go pretty good and then someimes it studders. It seems like it does it a little less when it is warm. It will still stall if you hit the throttle by hand too. I have replace the plugs, plug wires, Carburetor, fuel pump, vacum advance, coil, distributor cap, rotor, checked timing. Don't know what else it could be.