Electrical issues

Hello all

This past weekend I did a tune up in the old Z, new plugs, new wires new rotor. (the cap looked new). I have a MSD Blaster II coil along with a ZX dizzy (81 I believe). I'm having a miss fire under really all conditions and haven't been able to figure out why. I've checked the gap, resistance of wires (and the cap) along with the coil. Is there a way to test the "match box" (black box) on the ZX distributor?

Thanks all

Jan