I had this engine running back in December with the break in rockers on cause it was a new build. I just got back and swapped to 1.5 rockers and can’t get the car to idle under 1500 rpm. It has a small cam, blueprint heads, and a Holley 670 Street avenger on it. Ive checked for vacuum leaks and could not find any, the timing is set right and it will fire up as long as my idle screw is set at 1500+ rpm, the idle still bounces around a bit but is not really rough. Is this a carb issue?