Carter BBS 3838s Proper Idle Mixture Screw

If that ebay carb really is 4198, no tag picture, it will have 30A-121 mixture screw.
Sorry I just saw this now. Thank you so much! I have contacted the person on ebay about the carb. I will post a picture of the idle mixture screw to the forum if I have any luck in case anyone else needs to know what it looks like, tough to find photos of it anywhere. Thank you again!