Re: exhaust smells
Thump is correct. There are two main reasone for this. One is overactive catylist in the unit and the second is the engine is running rich. Incase you weren't sure, I described how you adjust the different components of the carb.
Adjust one idle screw for the most manifold vacuum and make the other match the turns. Run them both in about 1/4 turn. Check your main plug color for adjusting your main jets. Finally is the power valve. Drive around with a vacuum guage connected to manifold vacuum and monitor the readings when cruising at different speeds. You want the power valve to open at a vacuum level 2 inches below your cruise readings. For the squirter(s), I find you just have to play with them. Try squirters four sizes up and four sizes down and see what happens. If you have vacuum secondaries, make sure you don't have a real light spring in the diaphram. This will cause the secondaries to open too much.
Good luck, Eric.
If it ain't broke, I can probably still fix it.