I literally pulled the motor twice trying to solve why the valves, pistons and rings would sludge up after only minimal run time. I broke this motor down a few times scratching my head at what I was seeing. Well to make a long story short it turned out to be crud in the tank. I put new gas in the tank on top of some thick oil substance from the old gas evaporating out over the years it sat.
So this week I did the rear end, Center support and drive shaft u-joints. Rebuilding the rear end on a Toyota this old is pretty much a necessity. So I took my home made tool to press out the bearings and replaced both sides with inner and outer seals. A little paint clean up, new wheel cylinders and some new shoes and she will be just like new