Hey guys. I've got a 4bbl quadrajet on my 78 w200 (318). I was wondering if anyone had any tips on tuning them because frankly I dont have a friggin clue as to where to start. I know there are two small screws on the baseplate in the front of the carb and one in the center that drops down to the float. Then there is the idle adjust screw on the side and another screw on the opposite side. I'm not sure how to get the truck running properly. I just rebuild the carb and it runs nicely but the exhaust smells awfully rich to me. I've also got to get to the timing because its way off to. Do you suggest I set the timing correctly before messing with the carb? If so, I'll do it, but i'd still like to know how to tune it. Thanks felluhs.