Tinkering with automobiles has always been a part of the American experience! I’ll admit that I kind of miss setting the air/fuel mixture by changing the jets out and pulling spark plugs to check the mixture after installing headers, and setting the timing and dwell om my firebird formula 400 with a simple timing light and meter.
Granted, changing out the rear plugs on that car required going through the wheel wells.
Mark
The rear plugs on a Sunbeam Tiger couldn't be accessed without jacking up the engine. (Ford 260)