2.76 open to 3.55 Sure Grip...expectations too high?

It's all got to work together. A stock 318 2bbl won't feel drastically faster going from a 2.76 to a 3.55, but if you took a stock 340 car and went from 3.55 to 2.76s it would seem way more drastic!

In my '77 D100 with a warmed over 318, I went from a 3.23SG to a 3.91SG. I noticed right away that the truck was peppier and felt better going through the gears. A few weeks later I went back to 3.23s because I do occasionally do some interstate driving, and while I could tell the difference, it wasn't what I would consider drastic.

I think it always depends on the whole package. Big cams and high compression need more gear. Stock "low" performance engines do not.