Style manual: Archaic spellings and styles of punctuation in direct quotations from older works are to be preserved if they occur infrequently and do not interfere with a reader' s comprehension  However, if they occur frequently, the editor may modernize them, inserting a note with an explanation to this effect in the text, or if similar modernizing has been done in more than one quotation, inserting a general statement in the preface
On the other hand, obvious typographical errors in quotations from modern works may be corrected without explanation
An editor may modernize punctuation directly quoted from an older work if that punctuation occurs frequently and interferes with reader comprehension.