7 1/4 suregrip?

Ok so I'm posting this in the /6 discussions b/c I'm sure no one would put one behind a v8.
Questions are: how easy are they to come by? where might you find one? could you swap out just the internals or whole axle?

I know the obvious question is not could you but should you. I don't plan on putting a v8 in my car for a "while" (years) and from past experience 7 1/4 rears like to chew up spider gears even behind a /6 ... so would a suregrip 7 1/4 alleviate the inevitable ka-pow, bang,bang,bang from the 1 wheel burnouts I'm so fond of.
OR should I just get another 7 1/4 to swap out WHEN mine explodes, OR OR keep the old eyes open for an 8 1/4?
keep in mind I'm just thinking out loud.
Thanks