Should be a suggested range on your cam's card. The fella at the speed shop would also have a pretty good idea too, since he knows a little more about your setup and how well it's taking tune.

No, vac leaks, eh? Good. They can be a pain to chase down. Proper timing will definately make change to the car's performance, and could very possibly eliminate that hesitation completely. Sorry, I took it for granted that you had already set-up the distributor once that upgrades were installed.