Opinions on a 8.75" / 2.76 sure grip?

Hello,
I was wondering about putting together some shelf-parts; a 2.76 ratio in a 8.75" .489 rear end with a sure-grip cone diff.

The car is used for cruising and some tire-shredding fun, and runs a souped-up 360 with a 727, 2400 Hughes stall converter.
Rear end is 3.23 and peg-leg diff. Think it would be nice with the lower gearing for highway cruising and a little better fuel economy.

What do you guys think about such a combo?