Hi Kurt, I missed your post earlier. My f145 is a '69 build, I don't have the block or head number handy but it has the early 2 barrel manifold.
I bought some aftermarket wheel cylinders from you awhile back for my 40.
Now I'm hunting for them for my 67 Stout!
I dug pretty hard for Stout cylinders for my 1965. Best I came up with was having them re-lined.
They do show wheel cylinders forthcoming for the 40 Series.