which carbs?? wh, wmv, wmh?.. you will need ta use tha jetting that matches tha carburetor number you are using.............
although if its tha WH series (which is what pre '91's use) tha vent jetting is really not important.. some don't use any vent jetting even if it calls for 'em.. will make very, very little ta none on tha way it performs..