kz650 bobber in the making

Hi, new to the forums. i just bought a 1977 kz650 motor and frame. just going to use the frame for its vin and make a custom frame. I'm going to rebuild the motor but all i have is the motor and wondering what else i need. I plan on getting "750?" gpz cams and carbs. As far as wiring goes. Do i need a complete wiring harness to start from or if i bought one of those excell performence kits with new coils what else would i need. Thanks for any info.