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The cowl tag is the obvious thing, especially since the ad claims
It's a 1967 Oldsmobile 442 W-30 with all the right indications of true and original machine.
I posted the valve cover photos because not only are they predictably on backwards (notches forward) but the car has TWO notched covers. From the factory the 1967 cars only got one notched cover on the driver's side to clear the new-for-67 11" power brake booster. Obviously a W-30 only came with manual brakes, but all 67 442s (as well as Turnpike Cruisers) came with the one notched cover.
My 67 W30 did come with the power disc brake option and a 3.55 rear gear! An unusual combination for a W30 car. Since it was at an Olds dealer in South Carolina I would assume either police pursuit or bootlegger! Yes it also had the M21 muncie.