Hello, I just got my '81 316 back from the shop. Had the Solex carb swaped out for a Weber (the Solex seized up). I also had the mid-muffler replaced with a custom less-restrictive pipe. So, to my small problem; the car runs great, no issues starting it or accelerating, but when I pull out of 1st gear a puff of smoke comes from the exhaust and it definitely smells like gas. Also, when I'm just cruising you can smell the gas from the car, but it's not visible. Any thoughts?