That would explain things a little better!
It's still a big change - as I Gonked above, indicated 30 ponies better than the PI intake.
But if the "C" is better than the PI, and the "A" is better than the "C", and maybe the weather helped a little bit or something, stuff starts to fall into place.
Maybe the "A" is also lighter than the "C"?
I wonder if Ford added more iron to fix cracking problems hence the "C" is so heavy?