727 -> 904

I've always heard the same thing as well but how accurate is that? My car may pickup 2 tenths from one weekend to the next just from the difference in the air. I think it's way optimistic to expect even .15 from a stock 904 from a 727. You may see some improvement from a small cubic inch low torque engine but I really doubt there's a verifiable tenth of a difference. Heck you can get that or more just from a converter change and we all know the same converter wasn't used in both transmissions. What I think is an advantage in the 904 is the available (relatively) cheap factory low gear set and it's lighter weight. If not for that I don't see the point.