sierrax
+1y
I've gone through 3 stock rear ends with my old 302. Finally we noticed that the blocks were causing wheel hop, when that happens the rear end goes bang. Or it locks solid and you look like an ass. There is tons of rear ends that are the right width (same as stock mazda) but none have the bolt pattern. To change the pattern its like 500-800 in parts. I'd save and narrow a new GM fullsize rear end. It will cost about $700 to narrow it, but now you have something that can hold the power, is 6 bolt and has rear disc's. Sweet mod and no one will have it.
If you leave it I'd go to the wreckers and buy another stock rear end and get it ready to put in.