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.

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Chuck Taylor
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