65 Barracuda with factory 318??

I`ve heard similar stories like yours and 9 out 10 ,the engine ends up being a 273 or a later 318. I guess the only other thing would be a warranty replacement and a 273 wasn`t available? The car could have been special ordered because his father wanted a certain color or option, I wouldn`t base too much on that alone. My father special ordered nearly every car he ever owned, I guess he just didn`t like what they had on the lot at the time.