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I've never heard of this, never seen a refferce to this, or even dreamt of one (lol). But according to both my grandfather, and my shop teacher (and no, they dont know each other and are playin a joke on me), they do exist. And apparently pretty rare. like more rare than super cobra jets... is there such a thing?
I know they make a poke and stroke kit for the windsor that will make 427 inches. Don't see why they won't have one for 428. As for them being factory? Not a chance.
I think they may be reffering to an old-school trick of off-set grinding a 400M crank, and it would come out with something around that size. Or some people would just turn down a 400M crank to have a 400W.
I know now the have a something like a 450+ci Windsor motors from world products now.