You know that little vacuum can on your dist? Hook it up to manifold vacuum and readjust the carb. Ill bet you get 15" at the same idle rpm your at now, unless your trying to idle at like 600rpm or something low like that. Take it out for a test drive and if it pings at light load, you can use a 3/32 allan wrench in the hole where the hose hooks up and give a turn or 2 clockwise to limit the rate of advance. The cam I use in my Classic Cruiser 360 has way more duration that that comp cam, and they pull 17-18" at a 850 idle. You just need to dial the tune in a bit.
