No Replacement for Displacement (myth or fact)

Its Fact - the engine is an air pump,,,more air and fuel you can circulate through the more power you can obtain.

If you are making 450HP out of a 273 then you have a very good top end on it, an equavalent top end put on your 440 will no longer have you at "only" 450HP.
Same topend on either has you choking off the 440. You prove my theory here by putting the same top end on each of your builds.

If there was replacement for dispacement top fuelers and the likes would have figured it out to keep more money in their pockets.