Here are some pictures with the portion of the harness going under the manifold that is completed. I bought some special non adhesive harness tape to wrap the wires and attach the loom to them.
This one shows the looms attached to the webbing in the intake manifold.
I still have a bit of cleanup on the back of the harness to splice some of the key hot wires together and decrease the number of wires that will be running through the firewall.
On an unrelated note, I also cored through the bedside to run the gas filler tube through. This grommet is from a mid '70's Ford 150-350 TANK IN CAB truck, in case anyone has the same condition. The ID of this grommet is slightly larger (appx 1/8") larger than the OD of the filler tube, so I will eventually have to tack weld a collar onto the tube. I also need to have the tube spliced to the portion that goes into the gas tank, because the alignment was not correct. I will probably have that done at the same time I do the exhaust.