Pontiac made an 8.2" positraction 10-bolt for the Firebirds that is a great compromise, if you can find one. Unlike the Chevy positive traction carrier, it didnt have conventional preloaded springs and clutches but it will power both wheels in a straight line. It also doesn't have C-clips--the axles are held in by bolts at the brake backing plates. It's a bolt-in except for having to use a bastard U-joint and brake hose.
I tortured one of these things at the drag strip many times with a slicks in a mid-12-second car and it never broke, so it's strong, too. Just a thought. Good luck!