New coil no spark

Ok here we go ...... just completed the slant 6 to 318 convert in my 70 duster. All new electrical components are . Distributor, coil, ballast resistor, mopar orange ign box, plugs , cap, rotor. starter solonoid and battery. yesterday i got it running with new coil ran fine, drove down the road to a buddys , had a beer went to leave and no start. pulled coil wire off cap and put it to ground and no spark. so either my new coil took a crap or something else is going on but no spark there or to my wires . everything is new i grounded the ign box very well. all wiring seems fine . its a 4 wire box so 2 go to the distributor one to neg side of coil and one to the ballast resistor. i had it running driving fine no issues and bam wont start any help would be appreciated thank u