One air mixture screw no adjustment.
Ok I have a chevy 350 with 305 heads, mild cam, and stock everything else.the carb is a edelbrock 1406. I am sure that I have no vacuum leaks and have just rebuilt the carb due to the same issue I have tried blowing out the air mixture screw checked and double checked everything. I am at my wis end. I am thinking internal crack or blockage idk. But any help would be nice