Yup, another 318 thread

"Mis Match"

You'll not need a converter with that cam. I ran a 218 @ 050 with a stock c-verter and 3.21's on a stock tire without issue. Your looking at a few degrees less and a verter? I say step up in cam size and be able to use the extra RPM available that the 3.91's took away from the top end.