Power remains on with ignition off

[72K5CSTDarkOlive]

I was hoping to turn the motor over this past weekend but having an electrical issue and this one has me stumped. Spent the last week searching the board and web for any help but there doesn't seem to be any one right answer.

When I turn the ignition to either ACC or ON the power remains on even when I turn the ignition switch off and remove key. I have to disconnect the battery so it won't drain.

What I have done so far:
Disconnected alternator - power remains on
Took each fuse out one by one - power remains on
replaced ignition switch

To give you some context of what I'm working with.. here goes:

I'm using M&H complete electrical wiring harness front to back. It was converted to HEI and Internal regulated alternator. This kit is about 90% plug & play.

Grounds: 4 gauge wire from block to frame, other ground wires include frame to inner fender, frame to cab, 2 from engine valve cover to firewall, back of body to frame.

The front side marker lights, tailights, and radio stay powered on. The headlights turn on and off with the HL switch.