I know ! Another cam selection post

Im looking for help choosing a cam, my goal "high 12s", what i have, 70 dart ,391gears,14"wheels,245 bf goodrich,4spd,340 30over,performer rpm intake,electronic ignition conversion kit, 650 edelbrock carb,internals and heads stock, plan on headers and some port and polishing, i have 10.5 to 1 pistons and j heads, i appreciate any suggestions