Accursed Rear Drivers Spark Plug

I generally got the #7's out from 440s (both log manifolds and 1 with HP) by finding the right combo of tools.
Others have mentioned some already.
the body style and steering column type are a factor also.

I've got an old Craftsman set of these that turn into gold occassionally.

Square Drive Socket Caps, 3 Piece
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Also, don't forget to try the flex-head ratchet and the 1" extension bar.

And here's the thing most folks fail to recommend:
Figure out what works, and either take a picture of those tools, or write it down, and/or laminate it. Make multiple copies in multiple places if it helps.
My PITA 3.1 Buick oil-change 'kit' was a laminated photo of the best tool combo, placed in the cardboard box that held all my filter wrenches. IIRC a stubby 3/8" flexhead wrench was involved.
 
I found out a 4 inch Long rubber hose ( not sure about the diameter) that fits tight on the ceramic insulator is the easiest way to remove the plugs, once they are broken loose. It‘s also a safe way to screw them in by Hand, without Risk to damage first thread Winding. The rubber hose is so flex, it works also in an angled Position. This always worked best on #7 spark Plug.
 
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