I would stay away from stop leaks as they are known to plug more then just your radiator leak. [That's up to the owner though. ]
If you have the ability to weld aluminum. You can try to weld it. Not sure how successful it will be
I am not sure if anyone makes an expoxy that will bond to aluminum or not.
The aluminum would have to be Super clean too. Don't know if jb weld high temp would bond good enough to stop the leak for a bit. Being it expands and contracts like the exhausts do. I doubt it would seal it.
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7 3rd gens listed in the build thread (2 are parts mobiles)
Build Thread:
https://www.toyota-4runner.org/3rd-g...os-builds.html
Brillo's Bucket Fluid Ex changer:
https://www.toyota-4runner.org/3rd-g...ml#post3358086
Sparks Plugs Wire and Coil Information:
https://www.toyota-4runner.org/3rd-g...on-5vz-fe.html