Vacuum advance pod

I ended up getting a VC-167. I know there's a spec chart out there for most of the cans, my question is more related to what would be the "right" one for a 340 with a pretty run of the mill cam, I usually have about 15-16" of vacuum at a steady state cruise rpm of 2,000. I have an OD so my RPM's are a bit lower than normal.