I am stumped, need help

[dyingdeadman]

ok heres the problem, my truck stumbles while accelerating, pops through the carb untill it warms up and desiels really bad after being turned off.(sometimes up to 2, 3 mins) its a 72 gmc with a 402, hei and 750 manual choke eldebrock carb.

i have tried to adjust the timing and the carb. several times and several differnt ways. same problem. also i have checked for vacuum leaks but cant find any. all the vacuum lines are new. the carb has been rebuild, new plugs and wires put in like 3 months ago. dont know what else to look for or do. please help. its my daily driver.