Welding the spider gears would be a mistake. Something would break fairly soon, probably an axle. There is a very good reason that car manufacturers always feature some kind of a differential: if you plan on ever going around a corner, the inside wheel HAS TO either turn less than the outer wheel or else has to slip the tire some. Not so good on pavement. Hard on tires and if the tires bite well, very hard on the rearend components.
If you can get 12 bolt posi rearends that will bolt into your Nova for $300, buy all of them. I wouldn't be surprised if you could sell every one of them for at least $1000. They didn't make all that many 12 bolts for the smaller cars like Camaros or Novas. They were real, legitimate musclecar rearends and are hard to find.
But they did make lots of 10 bolt rearends. Some of them were tougher than others and have held up pretty well in lots of cars. The ones that are probably best have 8.5" ring gears, but most of them that I have looked into have the 8.2" gear. It is hard to say what your car has. You almost need to look inside to know for sure.
I think you might be able to find a good 10 bolt posi rearend in the $300 area, if you were lucky. Check those swap meets.
Another possible alternative would be a Ford 9". There are still a bunch of them out there that are about the same width as your stock rearend. The Chrysler 8.75" rearend is also pretty strong. But both use a different wheel bolt pattern than your Nova.
You might want to go back through the archives and re-read what people responded to your earlier questions. There was quite a bit of good advice there from guys that have been there and done that. You might be able to save a whole lot of money.
But again, I believe it would be a mistake to weld the spider gears in your stock rearend. At best, it would just ruin the rearend for driving the car. At worst, it might cause the car to become out of control sometime at speed which could kill you.
Good luck! And don't let your bench racing ideas ruin the usability of your first ride. HAL
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