Old steel Valve covers often had a metal tab welded in place...in this case, near the center of the valve cover.
A plastic wire loom clipped onto that tab.
The ignition wires were organized on the loom.
There might have also been other floating looms at very places to keep the wires in check.
The silver thingy on the wires is the distributor (cap).
You'll only see the thicker part when properly installed.
The longer skinny part inserts into a hole in the top of the the engine.
So I guess you have to cut off any existing distributor and drill a hole?
The extra tube in the package is so you can simulate boots (where the wire connects with the spark plug).
Straight boots are probably easiest, unless the ignition wires are wire, and formable?
That kit is for a 6 cylinder engine.
Only 6 wires coming out of the distributor cap.
Since there are only 3 spaces between the exhaust ports, you could use those and ignore the front plugs on either head.
That wire always ended up being too short when wires got replaced and always looked a mess. lol
[I may not be a great model builder, but I am a licensed Class A Mechanic (expired). Worked the trade from 1977 to 2001]