Automatic trans? No Stick? Not spraying 150 horse at the hit? KEEP the 7.25!
3.23 and 3:55 were popular gear sets in early cars, as were Sure Grip units. A little hunting will get you hooked up with a killer 7.25 for less than an ABody 8.75 housing will cost. If you're on a real budget, weld up the spiders and have at it.
Spider gears aside, that rear is MUCH stronger than people give it credit for.