I may have messed up here.....

Personally I would line hone, just to make sure. Usually when changing to studs or even APR rod bolts it is wise to machine everything up true. This is especially true if the new bolt/stud is torqued to a higher spec (APR rod bolts). On the girdle, I don't think it's necessary, but you have it and it definitely will not hurt to put it in.

Garth