Axle and Tire Combo

What's everyone using for an axle ratio and tire combo? Street, strip, or both

Running a turbo 318 in the Duster and currently have 255/60 15's with 3.55 gears from its NA days. Pulling a lot of rpm on the highway that seems unnecessary (over 3000). Wanting a little less highway rpm.

Thinking about 275/60 15s and maybe a higher rear gear but obviously keep a budget. I could do a 8 3/4 axle myself or a swap. found my sure grip to be not working so maybe even a axle swap would be better.