[blucar]

I find all of the hype regarding 'Matching Numbers' in vehicles to be quite interesting, especially when applied to vehicles manufactured prior to 1949, that being the point in time when the Federal Government required the manufactures to be more detailed in their vehicle serial numbers, ie; actual vehicle identification numbers in lieu of sequential production numbers.
In the so called good ole days, rebuilt/over hauled engines were as common as dirt, every large department and/or parts store sold replacement engines with generous payment plans.
It could be that Henry Ford figured the transmission/ power-train and chassis would last longer than the engine, that being why Ford did not put a serial number on the engine.