In the mid 1990s a magazine built a 440 to stock 375 specs and on the dyno came in just shy of 375hp. But then they added typical weekend bolt ons consisting of 509 Mopar cam, headers, single plane intake (Torker?) and different carburetor and dynoed 425hp. But we know that even if the HP number is not BBC impressive on paper an engine like this will punch well above its weight and can run well into the 12s.