<VV> No spark

[Ernie Sanders]

1967 Monza coupe,  pg, 95 h.p.      I took this car out on a drive this week and it started missing, sputtering.  I pulled into a station and filled her up with gas.  The car ran better so I just thought I had some poor gas.  Later drove it some more and started the missing, bucking at highway speed, and some times quitting for a moment.   Today I cranked her up and it ran poorly in the garage.  Then it wouldn't start.  There is fuel going to the carbs as I cracked the lines at the carbs and cranked it.  I have a weak voltage on the positive side of the coil.  Points, condenser, rotor, and cap are new.  I put my timing light on it and didn't have any spark.  Tried a new coil on it, too.  Any suggestions?  Thanks, Ernie in Louisville, ky.