Yep, ever see a Chrysler or Ford distributor wrench? In the '60's both Ford and Chrylsler V-8's had the distributor hold down bolts buried at the base and they could not be loosened with any normal box, open end or ratchet in any normal configuration. Proto, and probably some others like Snap-On, made C-shaped box wrenches just for this use. I don't recall what they cost (I had the Chrysler version for my Dodge 340), but it wasn't that much.

In those days before electronic ignition, you replaced the distributor points and retimed the car about every 10,000 miles so, if you did your own wrenching, one of these was a necessity.

Froze: thanks for the trip down memory lane. I had almost forgotten I still have one of those.