I always stick my index fingertip into the hole on the bottom, hold the tube at a reasonable angle, and slide the spark plug down the side. This way, the plug electrode hits my fingertip and the pre-set gap is preserved. After that, it's simply a matter of inserting the tube (with the rubber ring and metal washer previously installed) into the head (valve cover) and tightening the plug. If you're not sure of the "feel", use a torque wrench to tighten them. You do know of course, that you don't use spark plug washers on early hemi's. The soft aluminum tube bottom serves that purpose. You're on your own with the wire covers; just make sure you have all the stock clips. It makes it easier.
I would always, using a magnetic socket and extension, put the spark plug in the socket while holding it vertical and slide the tube over the plug. That way you can hold the tube with one hand, and guide the combo straight to the plug hole.
The Jalopy Journal
