The problem isn't removing the plug. I can lay underneath the car and reach up with a long open end wrench and get the plug out that way. My issue is I won't be able to get new plug in. I tried from every angle possible to get my hand thru or around the header to see if I would be able to just get the new plug in a few turns then go back underneath to tighten it.This is what I did.
Get yourself a 1/2" drive spark plug socket.
The 1/2" drive sockets do not have the step-down in them like the 3/8"
Cut it in half.
It will fit over the spark plug and the terminal end will pass through the socket giving you plenty of clearance to use a wrench to remove it
I have made a couple in different lengths to make my life easier.