The 70 RQA had a 350/300 and the only way to get to plugs 5/7 were, to raise the car using the main crossmember,...brace with jack stands under the frame.... remove the Dside whee and use a hole saw to cut through the fiberglass inner fender, to enable a straight shot with a socket for #5.
To get to #7, you had to lay on your back and approach from the Pside on a creeper until you could see the plug straight up from underneath. Then then reach up past the steering box with a socket in your fingers and place it over the plug, then attach the socket wrench and remove/reinstall the plug. You could not get a socket on a wrench in there in one move ...
Now, since I had an engine change and the heads are now the "dart style", its even worse...