Better gearing for my 7 1/4 SBP rear axle

Now that I am just about done with my brake swap it's time for me to think about changing that 276 gear that's in my 7 1/4 SBP axle. I do not really hot rod my Barracuda around but I would like a little taller gear say a 323 or 355 and would also like a sure grip. Are there still companies out there that sell gears for these small axles? I like the fact that I can cruise on the x-way at 80 MPH and when I first built this car that was my plan, but now I would like to be able to get out of the hole a little better and maybe even squawk my tires every now and then.
Thanks
Bob