L78 Nova Smog

[Markyodb2]

Hoping someone can shed some light on this:

I recently purchased a L78 Nova with a TH400 that has a smog system on this. I am wondering if there are any companies out there that rebuild these? I have a nasty wobble on the pulley and am wondering if would be better to rebuild the one i have or buy a re-pop and keep the one I have in a box.

Also, is there a true way of knowing whether the car originally had smog or not? I see a lot of different thoughts on this.

thank you