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Another source for a rear axle housing or rear end is DTS Drive Train Specialists in MI or WI. They make really strong rear end housings. DTS makes certain Mark Williams housings, they did a few years ago, not sure if they still do.

Like Keith S. I used upgraded stock 10 bolt into the 10s for a decade, now have DTS 12 bolt with chrome molly tubes, etc. and MWs insides, dual calipers each side with stainless steel single rotor [SS is lighter]. Dual calipers are for launching, not stopping. I am down on HP/torque to Keith only about 600/600, getting into the mid 1.30 60 foots.
Launch and stall in the 5s, think close to 2 gs at launch. And thats on radial 9 inch slicks light weight with over 25 PSI. Picture is with 10 bolt still in car.