check for vacuum leaks like shawn said...make sure that your vacuum lines are hooked up properly...that carb has a hook up in the base plate for your vacuum advance....also has a hookup at the back of the carb for a pcv vavle/brake booster hose....then set your timing to about 10-12* btdc on the balancer with a timing light....then adjust the carb idle mixture screws for the final time and set your idle rpm about 800-1000rpms