New Wiring Harness/Truck won't shut off

[CoxL01]

I have a 1968 c10 that I recently replaced the harness with a new one from LMC. Everything plugged right in and the truck fired right up on the first try. When I turned the ignition off, the truck continues to run. In order to turn it off I have to pull the wire on the distributor. I have researched all over and cannot find out the culprit and don't want to start diving into a lot of stuff that might not be the issue. The engine is a 350 with HEI. Has anyone else experienced this. I am thinking it might be a faulty ignition, or I may have the HEI wire on the wrong spot in the panel. The PO had a rats nest in their is the reason I changed the harness. Any help would be greatly appreciated.