318 Questions

Mike, are you sure the heads spec @ 68cc's?

Ethier way, carb cfm wise, you'll be good. The extra or missing 50 cfm isn't to big a deal. (Woul rather have it, but no big deal)
But I would not want to run a double pump with your set up. Don't get me wrong, you could do it, but I myself would rather skip it in favor of a vacuum secondary carb.