Yes the rating of the Ford 427 was 425 horses, but the real output was substantially higher. It is also common knowledge that Carrol Shelby reworked all the 271HP 289's supplied by Ford to a 306HP configuration in the 65-66 years. Now let me correct your 'facts' regarding the horsepower of the 65 327 Corvette...it was actually 365 HP with fuel injection. And yes they ARE awesome. BTW I've owned Corvettes, my favorite being my 66 with a 350 horse 327 (normally aspirated) but it certainly wasn't a great 'sports car', it handled like poo-poo and the front end starts to lift off the ground at around 130...
Maybe before you get so condescending with other posters you should check your 'facts' first.
Wow -- you are the man. Actually, some people list the 327 fuelie at 375. Doesn't matter. Box stock it is still way above the Cobra 289's 306 (by your numbers).
Anyway, for a lesson in condescension just read your first post.