I have a 77 FJ-40 I bought last fall and did a lot of cosmetic work to it over the winter. I just started driving it. It came with a webber carb. It runs really well and has lots of power. My problem is that when it is running it has a really bad unburnt fuel smell. The tail pipe is really black instead of gray. I ran a 428 stang with 8 barrels for years and the exhaust pipe was always gray. Should I leave well enough alone or is there an adjustment I can make to it to lean it out. Any help would be appreciated.