Mike,
The CP site states "CP 6644 wears the camouflage colours applied to Royal Canadian Air Force "Spitfire" fighter planes flown at the Allied invasion of Normandy, France, on June 6, 1944." The picture of the actual engine at their site (below) shows the drab green.
Frankly, I would try to return the engine to the seller especially if you were planning to have this engine lead other drab-green military cars in your collection. Your engine doesn't look like the one in the catalog nor the one in real life!