'68 fastback 440 wiring harness to suit

Hi, i performed a search here prior to posting but cannot find similar question.

Being over 50 year old car i am looking at replacing all harness (i believe 5 piece off memory) to be safe and avoid any future breakdowns.

'68 fastback 318 car to 440. Car will be street / strip. What harness are you guys using and recommend?
I Will be running MSD , i imagine new harness will be set up for Volts opposed to Amps.

If i run l.e.d headlights (pending how good of a light i can get from stock to begin with) is this irrelevant to what harness i get?
All factory features on vehicle will still be operational. ( Radio, blower fan, gauges ...)

Thank you in advance with any guidance