Just completed overhauls of the 4 webbers on my '79 308. Reset the adjustments to where they were pre-overhaul; car started up without much of a problem. Got out the old unisyn and now have the four breathing the same. Now, need to adjust the mixture - idle and main jet. I noticed all the main jet screws were previously screwed in all the way to the seat - maybe done by the last guy who smogged the car, I dunno. Can't find much about how to set the mixture on these things without a gas analyzer. Anyone out there have experience, or know of a reference on the web somewhere?