You'll have to take it to a gunsmith and have him drill and tap for scope mounts, and probably have to change out the safety lever.
I have a sporterized 95 Mauser (small ring) in .308 that my boss/gunsmith gave to me.
That's what we had to do with mine, should be a similar process with yours.
I don't know enough about the ATI stock to say, hopefully someone else will come along.
BTW, Welcome to the forum!
We have an introductions section if you'd like to tell us a little about yourself