My 73 Nova was easy to work on... points and plugs, replacing water pumps, alternators, distributors was easy and seemed to be done fairly regularly. I remember in the mid-80's when my wife and I moved to "the country" and we bought a Toyota for better mileage (we had a 100+ mile round trip to work in "the city" everyday). My Dad popped the hood on the Toyota and said, "Oh my God, you'll never be able to work on this thing. You can't even get to anything with all these hoses and everything. And that poor little engine will not last a year with the miles you guys are putting on it.
We drove that little car with little more than routine maintenance of fluids and wear items. We sold it with over 300k miles on it and the person who bought it drove it from Ohio to Florida and back twice with no problems. We have had similar experience with all of our cars since.
Yes, those old GM's sure were easy to work on.