I'd say the chutes and filter plant and pretty comparable to the Lehigh. Lower Yough I'd say is comparable to Brown's on the Ark. Zume flume on browns would be like cucumber on the yough if cucumber was longer. Those are the best comps I can make.
I'm from Philly and spent a year back there after paddling in CO for a while. If you are solid on the lower yough and have paddled the upper(I never have) I think you'd find Deckers(chutes) and Filter plant a bit on the easy side.
Here is a fairly subjective lists of runs in the area in order of difficluty.
Stepping Stones - EddyFlower Forum
Happy to paddle with you on some II/III runs.
Oh also Alto-Alto is class IV in the new guide book and on EddyFlower