Why don't you pull one of the valve covers off, line up to cam marks, and read the chain stretch of the timing marks? No sense in doing a chain if it's not needed. You really need to read the section on the front cover to decide if you want to get into it. You need to pull the oil pump and a bunch of other stuff.

The gasket kit comes with a gasket for the cover but most people seem to use RTV sealant.

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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