Under The Hood Of A 1956 T-Bird
No metric tools needed. The chrome disc houses the air cleaner, BTW. That's a V8 engine, don't know which one.
No emissions controls to get in the way. :) No computers or electronics. All you needed was a set of wrenches, a couple of screwdrivers, a $10 volt/ohm meter and a timing light. A shade tree mechanic's dream. This was back in the day when you really could fix your own car.
In real life you never saw a motor this clean unless it was brand new.
I over-sharpened this a bit so you could see the details when viewed full-sized.