1950 and earlier....pull down handles and NO wing vent
1951................pull down handles and wing vents
1952................Push button handles amd wing vents
but anyone could have changed the doors so you have to look at other clues like the 1950 had outside lovered vents driver side.

As 53moneypit mentioned, I also thought BOTH of your earlier photos were of the same engine to! The difference in side covers are pretty doggone easy to distinguish...one you see the diff.
The last link you provided told me I was "forbidden" and could not view it.

Goood luck and tell Rose hello.




1937 Chevy Pickup
In the Gallery
1952 Chevy Panel
In the Gallery
More photos
1950 Chevy Coupe
Pictures!

I'd rather walk and carry a Chevy hub cap than ride in a Ferd.
I can explain it to you, but I can't understand it for you smile