I have a 351 4v ram air on a 73 CV and it misses. I have changed points, dist cap and rotor, coil, spark wires, plugs, checked timing and chased grounds throughout. I cannot make it run right When I bog it, it seems to do better than just cruising. I have new gas tank, lines, hoses, and filters. I checked each wire with a spark test light and every wire exhibits a misfire every so often. There is no pattern or rythum to the miss. Can anyone give me some clues as to what might be causing this. What component might be sporatic? The distr is a mech advance dual point and I'd like to stay with the points. All ideas appreciated.