A couple of things.
1) Sharp Shooter Supply will provide you with the proper parts to fit the 7.62x39/6mm PPC case heads
2) Not sure whom you can order a properly chambered (finish reamed) barrel in this cartridge without getting a custom made (i.e. - not cheap)
3) Having done this swap a couple of time, I heartily recommend getting a go/NO GO gauge set, for comfort of mind. At least you'll know you did it right, plus you can always sell them later, if desired.
I'm not sure how much I've spent on my project, probably into the thousands now. I've yet to send more than 40 rounds down the barrel in any one chambering before getting "restless" and moving on - YMMV. I'd say $450 will get you in the ballpark......
Kaiser Norton