jeebers02

I just picked up a 1978 280z. The previous owners decided to leave sit out side with no spark plugs in it for 2-4 years and they also decided to take a meat cleaver to the engine wiring harness ... My questions are. I found a l28 out of a 1981 automatic 280zx with all if it's electrical pieces wires sensors ecm ect. Pretty much a couple drop out. Would I have any issues putting my manual transmission behind it dropping it in and getting it running ? I know the body styles have changed but I know nothing about the electrical. Any help would be awesome