What Harness and any tips??

I have a 72 Demon I am looking into rewiring. I am also debating if I will attempt it myself or hire it done. I am looking at the 22 circuit universal harness from Speedway, the similar universal harness from Painless, and the Mopar coded Painless harness. I currently have the Speedway harness in my 64 f100. 10 years and no issues but I did not install it. I am also swapping over to MSD ignition, adding an electric fan(s), have an electric fuel pump, plane on a decent stereo, Autometer gauges, and I have eliminated the heater box.

Any input from those that have done their Mopar?
What is a good location for the MSD box?