Yes, my valve cover has the two rear-facing slits, just no fill hole.
According to the spec. in the link from Waldo53, the engine could be a series 3500, 3700 or 5000- whatever those are.
Anyone know if those were original options in a 3100 truck?
According to the PO the engine and entire drive train of my 53 was replaced with a 49 by his father-in-law (original owner), to convert a 4-speed, which it is now... it still had the old column shifter bracket on the steering column, so I know it was a three-speed originally.
But after looking up the engine numbers and finding that it is a 53, I am starting to believe that maybe only the tranny was swapped. But then again the alternate oil fill arrangement still makes me wonder.
At any rate, it is good to have four on the floor.
