Funny story about how the Toyota NASCAR Cup engine was developed.... When NASCAR invited Toyota into the series, the carmaker did not have a suitable pushrod V8 so NASCAR said fine, invent one. Toyota said, okay give us the rules.
NASCAR said, "There are no rules. The engines were originally developed from production powerplants and evolved to what they are today. Just don't make your engine any better than the other in any particular area or dimension." These included bore centers, cam height and diameter, bore/stroke ratio, rod/stroke ratio, carb flange height, etc etc.
So Toyota said, "Fine, give us a list of the dimensions."
NASCAR said, "We don't have one. Never compiled one. This thing just evolved into what it is."
So Toyota went out and bought examples of the current Ford, Chevrolet, and Dodge NASCAR engines, tore them down and measured them, came up with a list of critical dimensions, and built their engine within the specs.
Soon, some Ford, Chevy, and Dodge teams were complaining that Toyota had "copied" their engines. Well, sort of, but not really. Some folks didn't quite understand the sandbox they had been playing in all those years.
This led to a joint NASCAR/manufacturer group that sat down and negotiated all the critical dimensions and created an actual set of working rules that they use today.
This is how it ended up that the Ford, Chevy, and Toyota NASCAR engines are all much more like each other than any production V8 engines. A number of their parts are essentially interchangeable.