I was changing spark plugs on my 350 with headers. I had problems reinstalling the plugs. No room for fingers or sockets, finally I cut off about a 4 inch piece of vacuum hose that fit over the cap on the plug, this makes a little , flexable extension and really helps the alignment and installation.
Old trick, but a good one. There's actually a tool out now that's more or less the same idea, but the end of the tube has a textured ball on it that allows for a better grip, especially if your hands are a bit greasy.