When blocking against Valk, you HAVE to watch when you try and IB>Poke or whatever out of pressure, some of his best stuff is the slowest. For instance, his 6B is +8 on block so on IB, you HAVE to keep blocking! 6C is +6 but easy to read so if you IB just watch for Wolf cancels as he can Kara Cancel it as well for extra shenanigans. Also in case no one knows, it may not LOOK like one, but his best launcher, 236C IS an overhead! If he hit confirms it well, he can cap out at about 5.5k from it so be careful.
Low profile is gonna be your best friend for this as it should go under everything except 2B, 2C(point blank), 3C and 236A/B. Also watch how you bait his wolf dashes. If he cancels into wolf form with 4/7D or he just does [w]4/7C, the little back flip he does has invul frames on it so he can actually bait out some moves very well.
One other random thing to note, depending on his spacing, some general things won't combo such as 5B>5C>236A won't combo at max 5C range so just something to keep in mind that spacing of his normals can very much vary his combo abilities. Best place to be is somewhere just out of Valk's 5B range so you can make him commit to some slower normals and punish from there.