8 1/4 or 8 3/4 rear end

Hello,

I'm looking for an 8.25 or 8.75 rear end to replace my 7.25 in my 73 Valiant. I'm going to do some performance upgrades to my 318 and feel the 7.25 will not handle it over time.

I'm locate in southern California. If anyone has one for a good deal let me know.

Thanks