'81 500SL Fuel Distributor Problem

[500SLinFLORIDA]

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I have an '81 500SL that won't turn over. One shop said that I need a new fuel distributor at the cost of $1200. I bought a used one (with a 90 day warranty) and installed it. It still won't start. I have no idea of where to go at this point. I installed the distributor about 60 days ago and the car has been sitting. Today, I went to a shop and was told that if the car sat then this most recent distributor is probably bad not, too. Is that true?

Thanks, BJ