When I bought my 37 pickup I had it shipped back from Delaware. The fellow I bought it from said it ran good a strong and it does. I'm thinking maybe the altitude change from Delaware and indiana may have the carb off a little. My 350 has a Demond 625 (1902) carb and it idles fine but when I pop the throttle it's sounds a little loaded up and the second time I pop the throttle it sound fine like it cleared itself out and sounds fine but it smell a little rich at the exhaust. How Can I tweak the carb to make it a little more on the lean side? Is there one or two mixture screws and where? Thanks for the help.