Cant get this to run, need help

Cant get this slant 6 to run. Several years ago I bought this 76 Dart Sport to restore. I knew there was something wrong with engine when I got it and figured it was a blown head gasket. We finally got some time to look at it. Long story short, it wasnt head gasket. There was a problem with block. I found another slant 6 out of a 74 Duster. I tore it down, replaced rods and main bearings and re-ringed it. Redone the head and put it all back together. Not knowing anything about this new engine, dist, coil, etc. I used everything off the original engine. The original engine ran good except for smoking some out the exhaust. I suspected antifreeze out the exhaust but it started fine, ran. Rebuilt this new engine with new rod and main bearing and rings. Before I put the head on I got No.1 piston up TDC and marked the damper pulley. Rotor pointing at no. 1 plug wire on dist.Tried to start engine and it just turns over. Pulled plug wire off no.1 plug and there is no arc when trying to start. So far we replaced ECM and ballast resistor. Coil is the same as the engine that was running before we pulled it down. Checked wiring and nothing seems to be broken. I am not a mechanic, but I do know enough to work on these. I did the same thing a few years ago with my 69 slant 6 and it fired right up. I dont know where else to go with this. But it doesnt seem to be getting fire to the plugs.Dist cap, rotor, plug wires, coil are all fairly new. Any help would be appreciated.