What gear ratio do you have and are your ties stock size?
If so, try a comp cams XE262H. It's power starts just off the idle and provides a nice power band.
My 318 3.21 syregrip equiped duster ran 15.14 untuned on a cold Nov. day, so, I'd bet high 14's are do-able. It was a stock 79-318 with headers and a MP ignition. Same intake and 600 Carter AFB carb.
