Starter is not cranking?

I had the same problem when I put a 318 into a Duster. The problem turned out to be no ground at the ECU, then I got spark. Also are you using factory electronic ignition? Or aftermarket. If after market take the + lead from the distributor, remove all wires from the ballist resitor and conect the red wire and all ballast resitor wires together, and disconnect the ECU in the car.....Good Luck