Thanks for the plaudits.
I have Canadian-specific Chevrolet casting numbers on my database up to around 1959.
The other way to tell is by the serial number and any prefixes. C = light commercial 216, T = heavier commercial 216, K= light commercial 224 GMC and G = heavier 224 as used in Maple Leafs. I have not yet found a Canadian wartime 235 but it could have had a TT prefix. The letter R indicated rhd of course.
Post-war:
ENGINE PREFIXES to 1953:
216 CAR: NO PREFIX
216 LIGHT COMMERCIAL: “C”
216 TRUCK: “X”
235 TRUCK: “T”
239 GMC/PONTIAC: “W” for “Walkerville”?
PLUS ALL R.H.D. ENGINES HAD “R” AS A PREFIX