My bronco has a 351m. it will not start unl...

My bronco has a 351m. it will not start unless i advance the timing alot. after i get it running i only have spark to #2,4,6,and 8 cylinders. I Have replaced the coil, condenser, wires, modual, cap, rotor. I used a jumper wire to 12v run on the ignition modual. All of the changes and parts havnt changed anything. To check the timing I brought #1 piston up to TDC on the compresion stroke and all was ok. None of the friends mechanics or parts houses have had any idea what is going on. Please help!