72 340 - What Did We Miss

Done a fair bit of work on sbc's but this is our first sbm build. This winter picked up a 72 duster 340 and we pulled the motor to freshen up. Ended up replacing bearings and rings but rest was good (forged pistons, nice performance cam, etc.). Put it back in car and replaced the old MSD 5 box with a mopar orange ignition box. Also replaced the wiring harness back to factory new with dual ballast resistor. Have gone through the threads and most suggest an advance at idle of 6-10? At first we thought the distributor was locked as could not get to run below 30deg advance. Bought a new distributor (proform) but no change. We have used piston stop to verify timing mark and no matter what we do the motor runs at 30deg, anything less and dies. Have disconnected vacuum advance for now to make sure doesn't go too high. Is there anything with the electronic ignition setup we are missing (lag, etc.)? Any other suggestions that couple of chevy guys might miss? Appreciate the help...