i see different part numbers listed for each the straight six and v-8's. Maybe try yours first and if it doesn't work, then you can get a new one.
i know with my 8 to v-6 swap you could use a v-8 cable for the six and possibly the 6 to 8, but i ended up using the correct cable for the 6 because i accidentally broke the plastic tab at the accelerator end on the 8 cable.
One good thing in your case is that v-8 cables are so easy to find by so many sources. Top quality stock and aftermarket. The same can't be said about v-6 cables.