ignition and wire troubles.

ok guys kind of a wierd problem.
I took a modified 2.8/rad4 out of a 75 coupe.
put it in a 77 t-top that was originally a 2.3/auto but someone else swapped in a 2.8/auto.
so I put the c4 on the modified 2.8 and got it in all fine and dandy, only took about an hour or so(done it II many times)
I also used the wire harness from the 75 from the back of the fuse panel, because the original 2.3 one was pretty hacked up.
so now it wont start. at first it would crank in the on position not the start position, but no spark. i''m now quite fed up, any help?
 
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