Here's another thing. I have a bunch of old road tests of 67 383 Barracudas. The best quarter mile time I remember seeing is 15.2; most were 15.4 or so. That sounds a bit anemic today, I know, but to put in perspective of 1967 (when drag strips were a lot slicker than they are today, and most road testers ran the quarter mile with two aboard and a couple hundred pounds of test equipment), every B body 383 tested in 1967 that I'm aware of ran low to mid 16 second quarters. That's a full second slower than the A body 383's. One would think that if the B bodies actually had 45 more horsepower, the extra power would have offset the B body's extra weight and they would have performed closer to, if not better than, the 383 A bodies.

So here's my theory: The 67 A body 383's didn't lose any horsepower compared to their B body brethren, they just got a more honest horsepower rating. I'll stick to that theory until someone disproves it with dyno testing or whatever.