On the question of Philly having any classic courses as untouched as Chicago Golf Club, probably "yes" and "no."
While certainly not the same level as Chicago GC, my understanding is that Whitemarsh Valley is largely as Geo. Thomas designed it around 1910. Also within the Philadelphia district, I know the folks at Trenton County Club cannot document their course's original architect nor any restorations to the course. Trenton dates from 1900, and it clearly has that funky character of a course where virtually no land was moved and the green sites appear to have be wherever nature found them.
On the other side, virtually all of the bigger "name" courses in Philly have been altered since their original design, eg, Merion, Aronimink, Phillly Country, Huntingdon Valley, Manufacturers.