I would look into the new electric locker that I think is offered by Auburn Gear. If it is made for your rear end, it might be a good solution to traction when you need it for a quick takeoff, but normal driving most of the time.
When the cars like that were fairly new, it wasn't hard to find a posi rear end in a wrecking yard fairly cheap. But 40 years later, I doubt you will find a GOOD original factory unit, at least for decent money. If you have a good rear end now, with an appropriate gear ratio, you probably could get it set up with an aftermarket limited slip differential or a locker for around $1000. If you need a different ring and pinion, this would be the time to do it, since the set up is more or less the same with new or used gears.
I have driven cars with both open differentials and limited slips, and a couple of trucks with lockers. In general, I would say it is easier to drive a car with an open differential than one with a tight limited slip. On the other hand, if you are fooling around with drag racing (or other straight line acceleration contests!, it just doesn't work well to only spin one tire. I think the electric locker would be a super compromise--an open differential most of the time, but a locked rear end when you throw the switch.
If you have a lot of power, you probably should worry about breaking the stock axles. And with C clip axles, when they break, they often come out of the axle housing. BE CAREFUL and good luck!
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