I Expect the C's spare factor to be reduced a great deal. I highly doubt you'll even see close to 200 cars assigned, as no other line has nearly the spare factor that the C has. I'd expect to see the C's spare factor more balanced with ENY's spare factor. If you give ENY and the C an equivalent spare factor, it comes to roughly 27%, you get roughly 184 cars assigned to the C, including spares. (I just did the math, in case anyone is curious, the J, L, and M would get roughly 204, 224, and 232 cars assigned respectively, including spares. 76 R179 cars would be on the J or M.) This is all based on the assumption that a roughly even spare factor is desirable, but I don't see why such an assumption would be false.
Also, I would expect all of the A and C's R179 cars to be assigned to the same shop. It makes no sense to assign the 4 A trains to a separate shop than the rest of the northern R179 fleet.
So as I see it, 76 cars to ENY for the J/M , 224 to either Pitkin or 207 for the A/C.