Here is the goldbook value for a '79 240D (they dont have data for a '83). Yours is probably more valuable because it is a euro.

Fair Good Exc Show Loan
1,700 3,000 4,800 7,000 2,500


I doubt they will total it. The damage value must be greater than the value of the car, and assuming yours is in good shape the car value is more than the highest damage estimate you received.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine