Sorry, I just hit the agree button. I was confuses as to why you mentioned the 440's in the 69's because we were talking about when the 383's first cane out in the 67's.
Post # 10 got me thinking about the B/ RB blocks and since they mentioned the older built 383 required I was wondering why? Putting a B block 383 in a Barracuda couldn't be more taxing than the taller RB 440.