Found/for sale 2 WW2 Ford V8's in crate

[Lynn Eades]

Tony, can you expand? Do you mean C81T heads? (C81A v C81T)
Firstly we need to differentiate between Canadian and U.S. production. Is this U.S. with Canadian heads?
The "Hydrovac" is a vacuum brake booster. The "Hydrovent" is Ford's early P.C.V. system. I am surprised to see the PCV valve fitted horizontally as they have no spring and rely on gravity (or am I learning something?) The Hydrovent makes this a 42 engine? with positive rear main seal, oil bath breather, etc.
What era does the 81A head stem from? This should dictate what block it is as the valve center line shifted. (not done in U.S. engines)
I am gaining some familiarity with Canadian engines, but these are U.S production and the few details I know become of no consequence when dealing with U.S. engines
I thought the extra oil port was std production in Canadian wartime truck engines?