Off idle stumble edelbrock and 340!!!!!!!!!!!

Still have a nasty stumble in my 73 dart sport 340 stock engine , with the excep of 600 edelbrock , its when leaving lights and stop signs , at high rpm doesn,t seem to do it stock intake spacer and carb , car seems to idle great, and takes it fuel good under quick acceleration , and has good flow of fuel at both nozzles , antbody have any suggestions , very annoying.