The problem with the other 45 "318 cam" threads is that they all come to the same ridiculous conclusions:
1- use the stock .400 lift cam because nothing is better unless-
2- use a .500-.600 lift cam with .300 duration and get 4.56 gears and a 3500 converter or-
3- build a stroked 360 with a solid roller instead.
Seems like for any other displacement, there are threads with comprehensive analysis that lead to 3 or 4 good choices.
We had one 318 cam thread with some promise where a couple of very knowledgeable members started to do that type of analysis but for some reason it just stopped.
Although I have no experience with either and can't crunch the numbers to tell anyone why the math works or doesn't work with a stock or basically stock 318 setup (maybe assuming dual exhaust and a 600 CFM 4 BBL), my money is on either the Comp "256" XE (or Lunati equivalent) or the Summit 690x (which ever is the lower lift, split pattern).
So far the only real analysis I've gotten from members on those is that "they are smaller than the stock 340 cam", which is actually a positive, sine the 318 is a smaller displacement engine. My addition to that would be that AFAIK, both cams I mentioned are "more modern" grinds.