I have heard that about NASCAR engines from several engineers, but cant get my head around it. Obviously the NASCAR engines are built to perform well at a precise rpm and have a very narrow operating rpm range. Below 4000 rpm they buck like horses but come on song at 7500. The intakes, heads and valves are optimised for a specific rpm.
So why wouldn't fuel being squirted through an injector at 27,000 psi atomise even better than a simple pressure drop through the venturi of a carburettor?