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Actually, the manuals show to leave the right side panel open and not make a custom hole. I enlarged my air intake hole in the right side panel and ran the hoses through it just because it looks better, but it does make it a PITA if you have to get in there.
IIRC, there is a front harness (I think for the 427 trucks) that sells really cheap. It usually is under $50. Buy it and take it apart for the wire and connectors.
Look in the different era's of the manuals. Early kits were alot more complex. Later ones didn't have alot of stuff, especially with the axle vents rerouted etc.