cam for 318?
That's the exact cam I'm running in my stock '79 - 318 in the Duster now.
It would like to see at least a 3.23 gear with a stock diameter tire. If you have less than 3.23's and NO lifters with the cam, use a set of Rhoads lifters.
This cam is capable of 14's without any major work. Well besides a set of gears.