This is the best vehicle I have ever had. It is supremely dependable and economical. Although I was a little disappointed that it started to smoke on start up and proved to have uneven compression at 152,000 miles, when I tore it down I discovered that it is extremely well made. The rings had started to give out, but the cylinders showed almost no wear. I have never believed in just doing ring jobs, but this convinced me that it may sometimes be possible -- it was in this case! This engine is actually made with a block stiffening plate between the oil pan and block, something I had never seen or heard of except in some racing engines. Like a Mercedes, it requires no pan gasket, just a little sealant. I could measure no discernible wear on the rod bearings and my machinist told me the same about the wrist pins. The weak links in this motor are all in the head and they are easily remedied. These are the valve dampers. They started giving out, one at a time, at about 80,000 miles and would sometimes really clatter when the engine was very warm and traveling at highway speed. After I rebuilt the engine the remaining ones gave out one day on my way out of town so I went back, ordered the whole set (about $18 - $20 each) and replaced them. I was able then to see the problem. They have an "O" ring seal around the outside on the bottom that seems to disintegrate when they get old. When that happens, they don't hold pressure and rattle in their receptacles. When they do this long enough it "mushrooms" the top of the valve stem and eventually the damper striking surface begins to disintegrate.
A few months after the rebuild I got a mysterious slow coolant leak into the engine interior. (into the oil) After many frustrating attempts to find it including removing the head and replacing the head gasket, a mechanic found it for me. It seems that the tower bolts that hold the camshaft and rocker arm shafts run clear through the outer shell of the head into the water jacket. They must be put back using a special sealer/lubricant to prevent coolant from leaking up the threads.
The radiator has very narrow channels that clog very easily. Every time the head has come off I have ended up needing to have the radiator core rodded out.
I run a good gas system cleaner through it once a year and the carburetor still works well. It gets about 27 miles per gallon on the highway and I expect to keep driving it till at least 300,000 miles. It's power is very adequate. How fast do you need to go, anyway? It is the largest of the small trucks of it's time and I find it very roomy. I am 6'4". It still has almost no rust and I live on Puget Sound.