Like Sixto says you can try RTV if it really is the VP cover. And... if it is the pump is the older version replace the whole enchilada. Replaced mine and no more oil leak.

My SDL story: Similar oil spray pattern particuarly on the dirvers front wheel well, top of A/C Pump, and down around the cranks seal to pan. I too thought it was the VP cover (old crimped style). I pulled the pump and filled the pump housing /cover gap with JB Weld. Installed a new gasket from Dealer made of gasket material for the housing to front cover joint. Still leaked as before. So I figured it must be oil from the front crank seal. While waiting to get in to have a local indy do the crank seal I decided to replace my Vacuum Pump, water pump, etc.

Too my surprise the oil leak was fixed by the new pump and a newer style "metal" VP to Front Cover seal. I put a "dusting" of permatex gasket tack spray on both sides of the gasket and lit it cure for 24 hrs prior to installation.

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1986 300SDL 440,xxx