Not worth buying to drive even if were free... period.

The only practical gasser W126 that can be had cheaply enough is a 300SE-SEL.

Here's an example of what a very nice example is going for.

http://www.peachparts.com/shopforum/showthread.php?t=269097

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1985 500SL Euro w/ AMG bits 130k
1984 300SD Turbodiesel 192k
1980 240D Stick China 188k
2001 CLK55 AMG 101k
2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!!