Gabet23

My name is Gabriel I am 27 and I have had a mustang for about a year and have fallen in love! Now as much as I love my car I want more power... I bought an 89 built 5.0 motor, transmission, and rearend. I didnt come with a wirring harness so i was just going to buy a msd ignition setup since its natrually aspererated I won't have to bother with the harness. I'm hoping I'm right and that this is a possible swap so I guess I was wanting some input on my choice and how hard this will be and any more info anyone would like to share with me please an thank you