Firing issues need help

[@justin]

I have a 1967 Plymouth belvedere 2. I just installed a fuel injected 360 magnum to replace my old worn carbureted 318. I hooked up my old starter wires from my old motor to the new just to see if it would turn over but nothing happened, I didn't have the computer hooked to the harness at the time so i wouldnt burn it up should it still turn over with out the computer hooked up. I'm confused some say it should fire right up some say I may need to rewire the whole car. Can someone give me some useful advice.

 

[BigBlock61]

Is the wiring harness to the starter from the old 318 or the new fuel injected 318. If it's from the new one the starter relay is grounded through the computer.