Had spark ,now I dont ??????

O K here goes.

We got the Duster running,but it had a oil leak at the intake manifold,so we took it back to the engine shop.We started it up took it off the trailer and parked it,they started it up and put it in the shop that night.
Next morning they go to start working on it and they cant get it started ,for some reason I dont have spark any more. I thought my Mallory Hyfire went bad so I put the original ignition module back on still no spark.Changed out ballast. Checked all wiring connections . still no spark,whats up ???? We even changed out the coil .It was new but figured that it might be bad,no difference.

Please help. I have to get it out of the engine shop tomorrow if I cant get it running. Thanks, Bob