That is the head and not the block There should be two screw holes about a foot from the center (fore and aft) Chevrolet depended on gravity on the top. Note washers under head bolts ???
If I remember right, early sixes like my 1929 have no bolts/screws along the top edge of the side cover. A lip hanging down from the edge of the valve cover is all there is to hold the top of the side cover against the top edge of the head There is a line of screws along the bottom edge, and acorn nuts on studs half way up the cover, but that's all.
The motor is in a 33 master. Not sure of what number it is. The oiler on the head is correct for 1933 per picture. The push rod cover has holes along the top but not in the head.
But it looks like you may have a head from an earlier engine. The washers under the head bolts suggest something funny is going on there as well. And some of your rocker arm adjusting screws are screwed out near the limit of their travel.
Found the number under the rocker arms. Looks like it is a 1929 head, therefore no holes on head for cover. The block does check out as 1933 number. Not knowing the history of the car is proving to be interesting. As I indicated the motor was running when torn down. Question would be do I keep the current head or swap it out for a 1932 head that I have on another motor that is not running? Opinions are welcome.
Those early 6 cylinder heads were famous for cracking. If you have a '29 head that is not cracked, I'm sure there is another Chat member who would be glad to purchase it from you. Be sure your '32 head is not cracked before you install it. Maybe someone has a '33 head to trade.