There are plenty of posts on adjusting the mixture with a dwell meter or a meter with a duty cycle, try a Search.
To get it to start, push the air sensor plate down maybe 1/2" with a stick while someone cranks the starter. If the car starts, this sort of verifies that the mixture is the problem. Then you can richen the mixture, going 1/8 turn (CW looking down) at a time and trying to start.
If it won't start with the plate pushed down, then you need to verify that the pump is running, check fuel pressure, etc.
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe