There are no per se kits unfortunately. Go to Sarcoinc.com. Look for the Tokarev pistol section. You can get 9mm barrels, also get the bushing and the mags.
The Romanians TT33s I have (got three through a kitchen table FFL who knew a distributor he built guns for personally) are SOBs, only one is still cherry, it's my untouched gun to rest safely at the back of my safe.
One I did in the standard 9mm. The other I did in 9x23 Winchester, it also fires .38 Super and 9x23 Largo, not incredibly accurate mind you, past fifteen yards with anything other than the 9x23 Winchester Silver Tips on bulls eye is difficult. The barrels are damned thick to me. I thought about doing other workups but I'm focused on rifles right now.
Look for Clark 'The Destroyer' he's a member on this site. Be polite and thankful and he might share his notes. I'm not sharing mine for legal considerations. Remember I didn't tell you to do it, don't suggest doing it, and would advise against it.