What coils did you use? Twin Ford EDIS-6??
1. Start with MUX-ed cable setup (one plug in live and one in dead chamber per coil). Measure ingition wires for equal resistance.
2. Re-gap all plugs to smaller gap.
3. If it doesn't work, change to new plugs (NGK B8EGV or such).
4. If it doesn't work, start fiddling with dwell time.
5. If it doesn't work, purchase bigger coils.
Thank you for your time,