“The 406-cu.in. V-8s were replaced in 1963 1/2 models by the new 427-cu.in. V-8 that used a 4.23 x 3.78-inch bore and stroke (This engine actually displaced 425 cubic inches, but marketing considerations dictated using the 427).”
https://www.hemmings.com/magazine/mus/2004/12/Ford-Galaxie-500XL—1963-1964/1281003.html
Hemmings made Ford racing engines, and that was in some of the 64 Ford police inceptors.
I didn’t know what it was until a guy a the auto parts store, who was also race car driver, came out in the parking to look at it because the new carb I bought for it wouldn’t fit. The guy went wild saying it was a special build Hemmings race engine, a 425!
424.96425 cubic inches, actually.
It was listed as a 427, hence my doubt.
Thanks for the info.